I can’t believe no one has said this…. Go to wrestling school!! The WWE strongly frowns upon those with no formal training. The best way to get in (unless you’re already a star in RoH or TNA) is to climb the ladder. This means going to a respected wrestling school, outperforming all your peers. Then, get a development contract. Then, go to Ohio Valley Wrestling (or another farm promotion). Then you might get a call-up to perform at a WWE house show or to participate in a skit. If you’re a breakout star in OVW though, you might have a shot. Most recent champs came through OVW- Cena, Batista, Orton. CM Punk made his name at RoH.
It’s a long hard road to get to the top, and it goes without saying that a lot of natural talent, charisma, and luck will help you along the way. Hopefully you’re also between 6’ and 6’4” and carry around about 250lbs of muscle with you. Most high flyers never get to be champ in the WWE.