Ahh, spells, my favorite subject
For Aerie:
Magic Missle, Chromatic Orb, Mirror Image, Invisibilty, Horror, Flame Arrow, Monster Summoning 1,2,3, Fireball, Hold Person, Lightning Bolt, Chain Lightning, Summon Fire/Earth/Air Elemental, Confusion, Domination and Shadow Door are imperative as wizard spells and will make Aerie a very potent spellcaster.
Her priest spells aren't all that powerful to begin with, but a few very handy ones are Cure light/medium/serious/critical wounds, Sanctuary, Negative Plane Protection and any Elemental Summoning spells are also good. Also, the 6th level spells Insect Swarm, Aerial Servant and Blade Barrier are great once she's gone up a couple of levels.
For Jaheira:
Pretty much the same as Aerie, just try a few new ones, see which ones you like and prefer, and just mix them around to your own tastes. I use Jaheira's spells to experiment with, so that might also be a good idea for you. Just learn whichever spells you want to, it's your game, after all
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Later,
