How can you register your son for professional football?

Perhaps you are asking about how to get your son started on a path that will lead him to the professional leagues (in the USA, the National Football League; in Canada, the Canadian Football League; in pro soccer, Major League Soccer). Most of the men who play professional football began their careers long ago; and by the time they were in high school, they were getting noticed by scouts who wanted to recruit them for college football. If your son is in elementary or middle school, you can sign him up at whatever school he attends; there are procedures for registering him, and that will allow him to participate in athletics. In college, the kids are older and usually make the choice themselves whether or not to play sports; you will definitely be consulted if a certain college is trying to encourage your son to go there by offering him an athletic scholarship.