It's recommended that you figure out your character's roles early on and what abilities you want to use on them. This basically means that the way Final Fantasy V is intended to be played is for you to cycle through Jobs throughout the game, eventually mastering them so that at the end of the game you use the Freelancer Job. Every Job you master gives you stat increases and sometimes even innate abilities that carry over into your Freelancer job. You start out the game as a Freelancer but the job is almost useless because it has no special abilities or stat bonuses. The main goal in Final Fantasy V is to master as many jobs as you possibly can because doing so will allow you to carry over Innate Abilities & Stat Improvements to the Freelancer Job.