You can find a handy-dandy price sheet here: http://www.furaffinity.net/view/23843890/
Terms of Service:

By commissioning me, you agree to the following terms:
-The art is mine, the characters are yours. (Duh)
-Payment must be made before I start working on your piece. This ensures you actually have the money and I'm not wasting my time.
-Do not edit the commission unless otherwise agreed upon.
-You can post it wherever you want, as long as you give me credit.

I do not draw:
-Gore
-Scat/Piss
-Vore
-Rape
-Heavy Bondage (Cuz I'm not good at it yet)
-Hyper
-Anything I don't want to

I have the right to decline any commission for any reason. If I need to stop your commission for any reason after the initial sketch phase, I will refund you 80%. After that, I do not offer refunds. I provide many examples of my art, so you should know what you're getting from the beginning.
If your character is especially complex, expect an extra charge of anywhere from $1-$4, depending on the type of commission and complexity of character.
I have the right to change these ToS at any time, as often as I want.

I look forward to working with you! :3c