So this is basically an answer in two parts: some general observations about clerics, melee, and so on, which seem relevant to you, and then specific suggestions for your character. I’ve tried to keep the first section brief; feel free

General Observations

Just some things I want to establish first.

Touch attacks are usually really easy

Granted, a −2 penalty from Strength is large, particularly since most people would have a +2 or +3 there, but nonetheless, touch attacks are usually very easy to hit – and they only get easier as you get more BAB, because touch ACs don’t really tend to go up much for most creatures.

So if all you were concerned about was touch attacks, I’d encourage you to just hold off; chances are you’ll be hitting them quite reliably.

Divine power exists

Just so you’re aware, divine power is a ridiculously powerful 4th-level cleric spell that gives you fighter-like BAB as well as a +6 bonus to Strength. That will solve almost all of your troubles. It only lasts 1 round/level, which is problematic, but there are tricks for getting it to last longer.

Your accuracy as a Str 12 character with full BAB will still be fairly mediocre, but it will be more than sufficient to consider touch attacks as good as guaranteed. Your attacks against armor will be sub-par but not embarrassingly so.

You never really need a melee character

3.5 doesn’t go in much for “roles” or even “having a balanced party.” Magic rules everything in 3.5. You look at your party, and realize it’s got two full-casters and a half-caster, and want to improve it? You don’t get a warrior, you don’t get a skillmonkey: you get another spellcaster, because the more magic you have, the better off you are.

Clerics, as it turns out, have some of the best spellcasting in the game. Top 5, easily. Druids, too. (The other three are archivists – who mostly use the cleric spell list anyway – artificers, and wizards.) With a cleric and a druid, you’re actually doing pretty well.

And if one of the full-casters is looking to do more melee, the druid is the far more natural (har.) fit. Once he gets Wild Shape at 5th, he could be a beast (har.) in combat. Natural Spell at 6th is basically what every druid ever should do.

On houserules

• Losing inflict doesn’t really matter because those spells are really bad. Inflict light wounds is relatively cheap for repairing undead, but those are evil under the usual rules, so it doesn’t really matter.

  • That said, other things might be lost that would be quite a bit more painful. How much this affects how your cleric should play depends on exactly what your DM is restricting.

  • It may not matter, but for what it’s worth I can tell you unequivocally that negative energy is not [Evil], and the inflict spells are perfectly acceptable options for good clerics.

• Bonuses don’t stack if they are of the same type. Magic weapon applies an enhancement bonus, the same as a +X weapon, so those normally would not stack; that is not a houserule. Bless does apply a morale bonus that would stack, but it’s a small bonus that isn’t worth your time anyway. I would only worry about this if a bard joins your party (as the morale bonuses from Inspire Courage can be a great deal more significant than bless).

  • By the way, because of how this works, the usual response is to make every weapon a +1 whatever special properties weapon, and then cast greater magic weapon on it. Greater magic weapon will not stack with the +1, but it will replace the +1 and let you enjoy a higher enhancement bonus alongside special weapon properties. This is a good thing; special weapon properties are usually better than enhancement bonuses anyway.

• Your wealth is not good. Characters are expected, per the Dungeon Master’s Guide, to be worth approximately 2,700 gold pieces by the time they hit 3rd level. Moreover, wealth is expected to be primarily in the form of useful items, not in gold pieces you cannot spend. D&D 3.5 responds very poorly to lower-than-expected wealth. This “houserule” (which it isn’t really; these are just guidelines in the DMG, but they generally should be followed) is really the one I would be concerned about.

  • But not as a cleric. Clerics don’t really care, because they can make their own magic. It’s the ranger who should be very worried about this, because rangers only get really pitiful magic and need magic items to shore that up.

Specific suggestions

Basically, I see two routes here for your character: pure spellcaster (the easier and more powerful option, honestly), or, if you really insist on melee, ruby knight vindicator (requires a supplement you may not have, requires adaptation to work for Corellon).

Pure Spellcaster

Melee clerics are usually Strength-based – their ability to use armor while spellcasting means they can safely ditch Dexterity, and Strength leads to better returns on melee. Dexterity-based melee requires more feats for less damage. You don’t have that option, since you have low Strength and high Dexterity, but that Dexterity is put to better use simply pumping your Initiative, and allowing you to cast spells before other people get to go.

Clerics have some of the best buffs in the game. You can make each of your allies count for that much more. They also have solid battlefield control, to prevent enemies from doing the things they’d like to be doing. Choose your spells with these in mind. Don’t worry about damage – the ranger can deal damage with impunity if you pump him up and eliminate enemies’ ability to threaten you.

Ruby Knight Vindicator

Normally, clerics are just about the best melee warriors in the game. Normally, they have persistent divine power on top of a naturally-high Strength score, and swing big, two-handed weapons. You don’t have that option.

You could take advantage of your high Dexterity score by taking Weapon Finesse, but your damage – still based on Strength – will be poor. The best way to use Weapon Finesse is by dual-wielding, but that will make it hard to cast spells and you don’t have any major sources of bonus weapon damage, like Sneak Attack, to make that worthwhile. Ultimately, considering just how powerful you can be by not doing this, it’s really just not worth the headache. It can be done but why bother?

I can think of one exception that would be effective, and a lot of fun. The ruby knight vindicator from Tome of Battle is an awesome and fun prestige class that will make you quite a lot better at melee. It also works out quite neatly for you, because it enables a strong Dex-based option. Things it has going for it:

• It progresses your spellcasting fairly well.

• It offers martial maneuvers, which are simply the best way to get better at melee.

  • It offers martial maneuvers from the Shadow Hand discipline. This is important because

    1. those are quite good,

    2. being in a Shadow Hand stance is a requirement for the excellent Shadow Blade feat, which adds Dex-to-damage with certain weapons.

Problems:

• It’s in Tome of Battle; I do not know if you have that book availble

  • If you don’t, I strongly recommend it. It is, far and away, the best-designed book Wizards published for 3.5. No other book comes even close in tightness of design.

• You have to qualify. That basically means taking a level of crusader

  • This isn’t that big a downside; crusader is awesome.

• As written, it requires that you worship Wee Jas. The official Adaptation section says you can “easily adapt it to crusaders devoted to almost any other deity,” but you’ll have to take that up with your DM.

If you were going this route, you would want to do Cleric 4/Crusader 1/Ruby Knight Vindicator 10. By taking the crusader level at 5th, your Initiator Level is 3 (it includes half your levels in other classes) – enough to take 2nd-level maneuvers. You get 5 non-stance maneuvers total, and 1 stance; you need 2 Devoted Spirit maneuvers, at least one of which is a stance.

Stance – iron guard’s glare or martial spirit

For stance, then, your options are iron guard’s glare and martial spirit – both are quite good. Iron guard’s glare gives your enemies a −4 penalty to attack your allies – incentivizing them to focus on you, and leave the more fragile party members alone. Martial spirit allows you to heal someone nearby for 2 HP every time you hit an enemy (has to be a real enemy; can’t play-hit an ally to heal up). Both are good options. Don’t get too hung up on it, because ideally at 6th level you’ll assume a Shadow Hand stance and never leave.

Maneuvers – mountain hammer and at least one Devoted Spirit

For non-stance maneuvers, you have a lot of options; you can just pick whatever looks good, and it almost certainly will be. One needs to be Devoted Spirit; crusader’s strike for healing or foehammer for big damage are probably your best bets. Aside from these, mountain hammer is an excellent maneuver that basically every initiator should take, and I rather like battle leader’s charge and tactical strike from White Raven. But really, you can take whatever sounds good to you; it will probably work.

Feats – Weapon Finesse, Shadow Blade are top priority

You should also see if you can retrain your feats. Combat Casting is weak (in a few levels you’ll basically never fail a defensive casting check) and Spell Penetration just doesn’t help that much, particularly if you want to get into melee.

If you’re meleeing, with your stats, you need Weapon Finesse. That comes first no matter what; without it, you are not a melee character, and should see above for how to be a Pure Spellcaster.

At 6th level, when you take your first level of ruby knight vindicator, you gain a stance and Shadow Hand is an option. That means you can take island of blades for awesome flanking, and then you qualify – right at 6th level – for Shadow Blade. Assuming you already have Weapon Finesse, this is your highest priority.

After these, you want Exotic Weapon Proficiency, and then Power Attack. Yes, Power Attack – if you want damage, this is how you get it, and you should have the accuracy to support it. Plus, you should be getting 2:1 returns, because...

Exotic weapon – Spiked Chain

That Exotic Weapon Proficiency feat is for the spiked chain – a two-handed finesse weapon associated with Shadow Hand. That list just hit every major point we needed. You get 2:1 returns from Power Attack, you get to use Dexterity for both attack and damage rolls. Plus it has continuous reach, which is just about the best property a weapon can have. In other words, this is an absolutely perfect weapon for you. Since it can trip, you should consider Combat Expertise, Improved Trip, and Knock-down later on.

Without retraining – Weapon Finesse and Shadow Blade ASAP

If you cannot retrain, take Weapon Finesse at 6th and Shadow Blade at 9th. You can take Exotic Weapon Proficiency at 12th and Power Attack at 15th if you want, but getting your Dexterity into play is your top priority.

could this work?

No. All weapons with the "heavy" property have the two-handed property as well. Here's exactly what each property does (PHB 147):

Heavy. Small creatures have disadvantage on attack rolls with heavy weapons. A heavy weapon's size and bulk make it too large for a Small creature to use effectively.

Two-Handed. This weapon requires two hands when you attack with it.

The heavy property itself isn't a problem here, but the two-handed is. Since all heavy weapons are also two-handed, you must use two hands to wield them. The enlarge spell doesn't give you the ability to wield a two-handed weapon in one hand, even if that weapon wasn't enlarged with you. Your DM might allow it, but it's certainly not part of the Rules As Written.

So what can you dual wield, then? Here's the rules on two-weapon fighting (PHB 195):

When you take the Attack action and attack with a light melee weapon that you're holding in one hand, you can use a bonus action to attack with a different light melee weapon that you're holding in one hand. You don't add your ability modifier to the damage of the bonus attack, unless that modifier is negative.

Based on this, you can only dual wield light melee weapons. You don't even need the two-weapon fighting style, since all the fighting style does is allow you to add your ability modifier to the bonus action attack. There is a way to get around the "light" limitation, namely the Dual Wielder feat (PHB 165, emphasis mine):

You master fighting with two weapons, gaining the following benefits:

• You gain a +1 bonus to AC while you are wielding a separate melee weapon in each hand
• You can use two-weapon fighting even when the one-handed melee weapons aren't light
• You can draw or stow two one-handed weapons when you would normally only be able to draw or stow only one.

This feat allows you (among other things) to use any one-handed melee weapons for two-weapon fighting.

In conclusion, you're not going to be two-weapon fighting using greatswords, even if you're enlarged. The closest you're going to get would be two longswords with the Dual Wielder feat

Side note: If you want to do two-weapon fighting purely from an optimisation perspective, you may want to reconsider. It is generally accepted as one of the weaker playstyles, as it uses your bonus action to be effective (needed to cast smite spells on a paladin, for example), and still can't quite compete with great weapon fighting, especially if you factor in the Great Weapon Master feat. It doesn't fall completely behind other playstyles, so if you want to do it because of a character concept, go ahead. But if it's exclusively for optimisation, it might be better to just use a single greatsword.