Check out this site http://www.fightresource.com/#
and search your state for schools in your area. Sometimes if you are beat financially, some instructors and owners of schools will let you do shit jobs like clean mats and teach kiddie classes in exchange for a free membership and access to classes.
It's up to you what martial art you want to learn. For your stature, Wrestling and Boxing would probably be your best bet.
If you put in serious time training you could realistically be fighting in under a year. How much $$$ you make is something else entirely .
Kamikaze145 should be able to help you as I know he's had a few fights himself.