A typical comic artists makes around 50,000 to 60,000 depending on the comic they are making. I would say that many comics are freelance, so they are probably paid per panel or strip. They also may change comics from time to time so that is why many of the comics are more freelance.
Depends. Obviously, the more famous and in demand you are, the better, and the better you are, the more pay. Starting pay can start off for a traditional penciler can start at between 10$ per page and $50 per page, and add another $20 or so if you ink your own pencils. Colorists can be salaried.