You generally need at least two pieces of armor equipment, and at least one of those should be a chest piece.
I'd never build a book without some way to prevent movement. Tanglevine, Force Hold, Enfeeble, etc.
A book needs at least one creature (or a conjuration that can take actions, like Wizard's Tower).
I think that at least two Attack spells of 2nd level is a good minimum. Force Hammer, Hurl Boulder, and Fireball are popular.
Like Aylin said, you're giving up a lot if you don't bring Teleport, Disolve, and Dispel. Depending on your mage's training, you might consider replacing a Teleport with two Force Push, but don't cut your last Teleport. Corrosive Orchid and Explode aren't great substitutes for Dissolve, so generally avoid them unless you're running a mage with an in school bonus. Seeking Dispel isn't required, but don't take 4 Dispels without taking at least one Seeking.