Im really lost :(

[Naberrie]

Since you've already unlocked CNJ, this will allow you to equip the Cure spell on THM to heal yourself during battle.

That will change after you unlock BLM, but we can talk about that later. Don't want to overwhelm you.

[Maero]

Once you get to blm you loose the cross class heal of conjurer.
Instead you can have Physic to heal yourself which is from the Arcanist class.
I highly recommend any blm get Quelling Strikes from Archer as it is so easy to get agro as a blm, QS reduces that
I started as a Archer as my Main class so i already had that portion unlocked and Bard is a fun class as well. But blm by far is one of the more damaging dps classes.