OK so now I started a new game. I took a lesson from FF1 and started my party with the fail safe F/F/F/RM. But now I am starting to remember how this game works. If I level up with mages my characters magic gets stronger but can I continue to cast black spells if I switch to a white mage? If I am a fighter my strength would go up right? So I might want to switch a couple of my fighters to monks to make sure they have lots of HP. Is this correct?