You mean class spells or ones you gain from AA? For Class spells talk to the Wizard Trainer in any main city of your alignment. Just hail a guard and ask them for the Wizard. For AA they should be automatically added to your spell-book.
Passive spells are usually just effects that augment existing spells. If you are talking the AA in the Wizard tree "Enhance: Solar Flare" that spell only adds modifiers to your Solar Flare spell not actually gives you a new spell.