On top of what jmelekey said, you need to keep in mind terrain.

If you go through with the wizard idea, I reccomend a big ol' multi-floored library with big book shelves, that you could potentially knock over and do non-lethal damage with.

It helps to include the terrain in on fights :3



(Like for example, no one testing an underground room beforehand, so they walk in and all of a sudden it room explodes violently for 8d6 to everything in the room because it was full of methane gas... all because of a torch. For added hilarity, make it combust in a wizard's face when he casts a fire spell :3)