You have to get yourself noticed. To get noticed, you have to hone your craft. Go out and try to work open mic nights, then try to get booked at small comedy clubs. Keep working and paying your dues and you COULD Become successful.
Come on now, we all know this is based on opinion. However, popular comics include George Carlin, Robin Williams, and Dane Cook. However, I happen to like Seth Meyers, Jamie Kennedy, Bob Saget, Jim...
Depends on the venue and how popular they are. There is no set amount. An established comedian with a large fan base will make much more than someone who is just starting out.