If I kill all the mind-controlled dudes, does this make me evil(lose rep), or turn other soldiers or Mitoa or Alix against me afterwards.
If you look on your mini map you will see them as red crosses. All red crosses are hostile and therefore you can kill them without losing rep.
You may see some green crosses on your mini map and when you go near them,they turn red becuase they have become hostile. Here you can kill these without losing rep or you can just run away and you will see the character as a green cross again when you have run far enough.
Can you buy trail bombs, spider traps and all that, or can they only be found.
Blake also sells them sometimes but they can also be found as a random drop.
Other skill tips?
Some wizards skills can be bought or found,indeed i was a rogue and only spent 1 skill in wizardary and that was hellspikes in the very begining of the game.