contact the promoters directly (usually a link on the websites) and send them a HL or tape of your fights. Get the dialogue going with a few shows and fight in the one that ponies up the most cash.
Wins usually mean a pay raise (especially if they are by flying arm bar

) and once you get a few fights in the books as a pro getting an agent or manager to do the leg work should be easier. Unless you train at MFS or Team Quest or something YOU are your agent.
The paperwork for the athletic commissions is usually online and the promoters can direct you to it. The medical screening isn't too bad but it might run 100-200 depending for the eye check and physical, it depends on what your state requires.