Please give me any and all the help you can...?

I am 20 Yrs. old and I am VERY interested in playing for the AFL if not the NFL. I realize there is a pretty slim chance of me getting drafted into the NFL, so thats why I am going more for the AFL. I was wondering did anyone have ANY imformation on any camps, combines, or tryouts for any NFL or AFL teams? I have a history with football, but did not play in college. If anyone could lead me in the right direction on this one I would really appreciate it. I am a 6 foot 285 DT and would love to play. Please give me some info. Thanks.