Lisanna,
There is no advantage in the warrior and rogue roles that the elite roles don't have, so switching them no problem. Spellcasters I usually switch as soon as they got all the spells I want them to have. Though I'm afraid that advice is not too useful for beginners, because they often don't know yet which spells they need and which they can do without.
So here are a few of the higher level spells I wouldn't want to do without:
spirit: resurrect (5), restore health (6)
sun: illuminate (3), burning haze (5)
moon: create portal and teleport (6), call of home (7)
vine: cure poison (3), cure (6) (Some want breath of air (6) as well.)
stone: negate magic (4), stone to flesh (6), lava walk (6)
Some people will skip negate magic, but I like it for removing 'reflect damage' from opponents. (A nice spell for yourself by the way, but not necessary.)
Furthermore you'll want some damage spells like lightning or incinerate, and at least one storm spell (ice-, fire- or meteorstorm), and some party boost spells, like heroic might or frenzy. But those are interchangeable, so you can almost always get one of those. Just choose the rest as you like.
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