The short answer is, you are going to have to gear for healing, as it requires completely different gear than feral. Though if you don't have a rogue in your group, I am sure you'd be able to pick up Feral gear while your gathering healing gear. Each PuG is different, just ask if you can roll on things for your offspec, but dont take gear from people who may need it for the instance you are doing. Most people are understanding in 5 mans that you will want gear for multiple specs.
Anyways, I've compiled a short list of links that I believe will give you a hand understanding the Druid as a healing class, and available options from lots of different players.
To start, here's a quick summary of what people view druid healers as:
Resto Druids: Druids are perhaps the
most necessary healer in any 10/25
composition. Mostly because of
Blizzard's encounter/item design
during and after Ulduar. After Burning
Crusade, Druids were trying to find a
niche because Blizzard nerfed their
insanely awesome Lifebloom. I think a
lot of Druids went into Wrath looking
to continue being tank healers, and
it's something they're still good at.
However, they found their niche with
raid healing through something called
Rejuvenation Blanketing. Basically, it
just means that they put Rejuvenation
on as many raid members as their
haste/positioning allows. Blizzard
reinforced this through incredibly
strong set bonuses for T8 and T9 that
boost the power of Rejuvenation
incredibly. In addition, the pulsing,
constant raid damage of a lot of
Ulduar/ToC fights basically plays
right into Druids' hands. Rejuv
blanketing puts out a stunning amount
of throughput that is almost
unmatchable. Like I mentioned, rolling
HoTs on tanks is also a strength of
Druids and really evens out tank
burst, though I seldom assign them to
tank healing unless very necessary.
They can tank heal just fine, but it's
a waste of their true power.
From: Druid vs The Healing World
There's also been an incredibly useful survey of Druid healers based on a survey called "Circle of Healers", with many blog post responses:
Druids
- Lathere, Druid, Restooration, Hots & Dots
- Kailanii, Druid, Restoration, Sheep This
- Kotakh, Druid, Restoration, From Miss Medicina's Blog Comments
- Sammich, Druid, Restoration, Kungaloosh
- Kaelynn, Druid, Restoration, Dreambound
- Aanthe, Druid, Restoration, The Angry Healers
- Verile, Druid, Restoration, Rejuvo
- Sersokhi, Druid, Restoration, Sushi-Cookie
- Kochi, Druid, Restoration, Rambling Dwarf!
- Tatia, Druid, Restoration, Dots & Hots
- Isla, Druid, Restoration, Unreal Realities
- Dysmorphia, Druid, Restoration, Dys-Morphia
- Hermia, Druid, Restoration, Tree Of Doom
- Ikkulu, Druid, Restoration (PvP), DorkArt
- Firewood, Druid, Restoration, Tree Haelz
- Bellwether, Druid, Restoration, 4 Haelz
- Lissanna, Druid, Restoration, Restokin
- Forrestump, Druid, Restoration, Forrest Stump
- Wingood, Druid, Restoration, Evian Tree Bear
- Elsen, Druid, Restoration, The View Through the Branches
- Killh, Druid, Restoration, WoW Frost Mage / Piou Piou Blog (French)
- Oestrus, Druid, Restoration, Divine Aegis
- Buel, Druid, Restoration, Buel's World
- Tazha, Druid, Restoration, Wild Growth
- Innoue, Druid, Restoration, Druid Tree
Other topics that may help:
Resto Druid - Starting raiding mana regen numbers?
What spellpower should a resto druid have before raiding
Building a Balance/Resto spec — DPS while healing in heroics?
In terms of classes, trying to cover all three roles between the two of you is a good target. When you guys are questing together by yourselves, having one person be DPS and the other healing helps keeps downtime to a minimum. And if you guys decide to use the Dungeon Finder, having one person able to heal and the other be able to tank ensures you'll never have to wait long in the queue.
Blizzard has homogenized the classes over the years so there is a tremendous amount of overlap between the classes and specs. As long as you guys cover the three class roles, feel free to choose whatever fancies you.
For reference the hybrid classes are:
- All three roles: Paladins, Druids
- DPS + Healing: Priests, Shamen
- DPS + Tanking: Warriors, Death Knights
If you're going to take my advice about role coverage, you'll want to avoid Mages, Hunters, Warlocks, and Rogues as they can only be one role: DPS.
Since you're talking 1-85 play, Death Knights are off the table as they start at level 55.
Putting it all together:
- Person 1: Paladin, Druid, or Warrior (to cover tanking)
- Person 2: Paladin, Druid, Priest, or Shaman (to cover healing)
In terms of professions, I'd avoid the heavy crafting professions that take a lot of time to level up and are usually taken for the Bind-on-pickup endgame recipes: Blacksmithing, Tailoring, Engineering, Leatherworking. Instead, focus on the professions that'll let you help each other out while leveling, like Enchanting and Alchemy, or the gathering professions, like Mining and Skinning, which will prove lucrative and won't require too much (if any) time soloing.
Best Answer
The heirlooms are super effective items. They are equivalent to some of the best dungeon drops you can get(or better) and they keep up every time you level.
Spirit only matters in long fights (five minutes or more) such as raid bosses. It shouldn't matter for dungeon instance running. You should manage your in combat/out of combat time so you can drink if your tank is chain pulling. Sometimes it's worth it to allow the tank get out of range so you can finish your drink.
Resist the temptation to heal stupid. If the tank pulls before you're ready, he deserves swift death. If the dps pull before the tank is ready, they deserve swift death. You don't have to kill bad party members, but you don't have to save them either. If you try to save everyone from their mistakes, you will run out of mana.
I put together the efficiency statistics for my 68 holy priest that has a couple of heirlooms and no WoTLK gear (this research ignores crits, and considers chakra:serenity and Inner Fire). You might be able to use this information to choose more efficient heals and better keep up with the group.
Heal is super efficient and should be a go-to choice. Low heals per cast time is the downside.
Flash Heal is super inefficient and should be a last resort (except when it's free).
Power Word: Shield is super inefficient - last resort. Holy Word: Serenity is the go-to rescue spell. Renew should be kept up on tank, as it can be extended free by any direct heal via Chakra: Serenity.
These spells would be mana efficient if everyone took damage at the same rate as the tank. These are group rescue spells. Their efficiency is comparable, so use the one that fits your time and aoe shape (you+1 vs all). Slight nod to Prayer of Healing for low mana per second.