If I understand correctly, your problem is that any feats on Bard level 1 can't go towards Dazzling Display, because you need Weapon Focus first, and to get that you need 1 BAB. However once you're level two, you could, but you already spent the 1st level feats on other things.
According to the official FAQ, retraining is a great option for you:
Retraining: Can I retrain a feat to replace it with a feat I didn't
qualify for at the level I originally gained that feat?
Yes. As long as the new feat is a valid feat for your current
character, you can retrain the old feat and replace it with the new
feat.
For example, if you are a 3rd-level rogue who took Improved Initiative
at 1st level, you can retrain that feat and replace it with Weapon
Focus. Even though Weapon Focus has a prerequisite of "base attack
bonus +1" (which means you couldn't take it as a 1st-level rogue), it
is a valid feat for your current level (3rd), and is therefore a valid
choice for retraining.
(Note: Likewise, the fighter class ability to retrain fighter bonus feats does not require you to meet all of the new feat's prerequisites at the level you originally gained the feat.)
Here's how that would look for a 2nd level human Bard:
Costs
10 × your level × the number of days required to retrain
= 10 gp/lvl/day x 2 lvl x 5 days/feat x 2 feats
Total cost: 10 days @ 8h/day and 200 gp / 2 feats
Note also that
Some retraining options require you to work with a trainer. If no suitable trainer is available, the GM might allow you to retrain yourself by spending twice the normal time. Even if you train yourself, you must still pay the cost for training (though you don't double the cost as you do the time). Any option that requires a trainer also requires some kind of training facility for that activity.
You're confusing two different game concepts, which is understandable considering someone made the mistake of giving two completely different things very similar names.
Breaking it down:
- The Race you choose has Racial Traits. You get all of these automatically, just like you're thinking of. You pick a dwarf? You get all the dwarf racial traits. The "Gaining Traits" thing you found has no relation to these.
- Then the Advanced Player's Guide introduced a thing called the Trait system, which you can read about there. This is what the "Gaining Traits" thing applies to. These are optional mechanical bits you pick up for your characters. These traits are sorted into various lists, like Combat Traits and Equipment Traits. To confuse matters even further, one of these lists is also called Race Traits, which are so called because they always have a particular race for a prerequisite.
The racial traits from #1 have no relation at all to the traits system and race traits from #2.
The traits from the Trait system (#2) are like flavourful mini-feats you pick at character creation and which might reflect your character's personality or background (or you can ignore that bit). It lets you pick up neat features like an iron liver or an aptness at being a tactician. The Trait system is optional and your group can ignore it entirely.
Best Answer
The Spirit of the Waters elven alternate racial trait gives proficiency in longsword, trident, and net.
Also the Huntmaster cavalier archetype.
More generally for exotic weapon proficiency, the half-elf Ancestral Arms alternate racial trait gives you a free exotic weapon proficiency for which you could choose net.
There's other more long and painful ways - like a dwarven oracle favored class option lets you reduce the nonproficiency penalty by 1 each time you level, so by level 4 you could be net-proficient. Kitsune and Hobgoblins have an option like that too.
There's a bunch of third party classes that give net proficiency, not sure if you just want Paizo-published or not but search in the classes on the d20pfsrd if you want those.