What should i do about american football?

I'm a rugby player form England and i have recently developed a very strong interest in american football. Im 16 years old and i play rugby to an extremely high standard, playing for not only one of the best recreational clubs in britain and being the top scorer (26 tries in 9 games), but also for the regional (state) team, and a professional academy. Im a winger in rugby and i have an unmatched ability to beat almost any defender i come across one on one. This is because of my mixture of pace (100m in 11.8 secs), my size (6ft 180 lbs), my agility and my ridiculously good stiff arm (hand off). I score the vast majority of my tries by handing off defenders, and i am able to do it at the top levels of the game. However i cannot help but feel that my progress in rugby may be very limited as i lack certain core skills that are essential in the game, but aren't in american football such as passing, kicking and tackling technique. Although my tackling technique is pretty poor for rugby as i tend to aim high, I hit with great power and i am not afraid of hitting someone much bigger than my self. My style of rugby has often been compared to two professional players. These are jonah lomu ( http://www.youtube.com/watch?v=enu845TMtjQ ) and more so, greg inglis ( http://www.youtube.com/watch?v=jfr7NGMKGJk ) who as it happens has recieved serious interest from numerous nfl teams. I am a very dedicated athlete and i have spent my entire life ensuring that i am in perfect physical condition ( six pack and all that **** :P ). I have swum competitivley since i was 6 which has made me into a very fit sportsman. I am also incredibly strong for my size as a result of alot of gym work. If it turned out i was very good at american football, i would make it my life, ensuring that i achieve the most i possibly could. I would like to know a few things; First of all, How do i get involved in american football? secondly, what position would i be best suited to play and how good would/could i be at that position? and thirdly, what level could i possibly achieve in american football?