Normally what I do is make a very FF1-esque team with the first set of jobs, and then when I've either mastered a job or have the abilities I most like, I switch them to another job which would benefit from the abilities I got from the previous one, or just kind of "fits" somehow. For example, giving a former White Mage the Time Mage job so that they'll have all of the buffing of the Time Mage and all the healing of the White Mage! Sometimes I do things like give a Knight or other sword-user white magic since it makes me think of paladins, too. :P Plus there's things like giving the Sword-Magic guy dual-wielding of the Ninja.

Stuff like that. =)