Get him into a decent grassroots team and let him enjoy it. The rest will come if he’s naturally talented. If he’s playing at a decent level in a years time, additional training is a good shout. By U8’s they’re looking for the more technical players, strong, quick, ability to read the game and act quickly. Academies will “pre sign” U8’s, then the most talented will officially sign ahead of U9 season, when they must give up all other teams and only play for the academy.