Going from Rugby to Football?

I'm usually pretty modest but I'm not going to lie, I'm a pretty dang good Rugby player. I've competed at club and currently in the collegiate level, I've also been invited before to compete at the international level. Yet I've always had a pion for Football. Right now I'm at BYU and have been contemplating walking on. I know I have the athletic ability so I think its a matter of how hard I want to work to gain the extra muscle. Think it's a good idea? Right now I'm a 5'9" 190LBS wing. Very fast, agile and very fit. Any suggestions as to what I should do to accomplish this.