How do I get a mount?

[Conradus]

I thought Iwas supposed to get one at lvl 20?

You'll need to do the storyline quests; when you get into a Grand Company you will then have the opportunity to buy a chocobo for GC seals (2000, I believe). That'll happen at the level 20 quests in the storyline.

[Conradus]

I believe you can get the unicorn as soon as level 30, you have to be a Conjurer as well, cannot be in your white mage specialization.

It's not enough to just be level 30 CNJ, you'll have to do the level 30 class quest as well. That unlocks the unicorn quest (which is trivial).

[Frah]

This here might help How to get a Chocobo

[CodasiosD]

I am very thankfull that we have such a helpful comunity!!