The Wizard class does not have sub classes like Druid, Cleric, Necromancer, etc. Instead your spell selection allows you to focus in on the type of Wizard you want to be.
Spells are only separated by Alignment: Law/ Neutral/ Chaos. Your alignment influences your ability to cast spells of a different alignment.
In addition, I am looking to switch up treasure type a bit by basing it on creature HD. That may not work exactly as I hope, but its a work in progress.