To become a witch (female) or warlock (male) in TS2 it requires the Apartment Life expansion pack. Once you get it you have to go to the community lots and look for the Head Good Witch or the Head Bad Witch. Once you find them, become good friends with them, then you should see an option that says Teach me the way of the light or something like that, then she'll wave her wand and you'll become a witch. In your inventory you'll find your own spell book and a cauldron, used to make potions and ingredients for spells. Hope I helped.