[Talthyr Malkaviel]

Helspanth got most of it, but I think you got a couple things wrong.
1. No, you can use magical equipment like armour and weapons, it just means you can't use potions.
2.It's not really a skill, but each time you successfully hit a magic user they get an accumluating spell failure rate.
3.Your choice, but I'll say this, Katanas are very good.
4.Probably agree with Helspanth here, or if you wanna be extra cautious a little higher.
5.Not really.
6.They get a cumulative magic resistance as they go up in level (very useful)
7.See No.3
8.Yup, well most of the way through, windows screwed up so I had to re-install, but near the end.
9.Whoop some magic user ass.
10.What Helspanth said.
11.Yes, important thing here, since you can't use any type of potion, watch your health in tough battles, they may have a lot of hitpoints, but if you can't use potions and he gets killed out of the blue, it's very annoying.
A good idea is to always have a cleric with healing spells at the ready.