How can i join moto gp?

Sorry to burst your bubble, but you cant. The top 50 riders in the world who race at the high end of their choosen class, MotoGP / Moto2 / 125 , World Superbike / Sport etc, started RACING (not riding) at the age of 4 or 5 years old. Only in recent years has one rider who started as late as his teens, has gone on to to any good. If you are already on the racing scene, winning almost every race you enter, and have won multiple championships, then you might be able to move up to world level, but nobody starts on a MotoGP bike. Teams dont gamble on unknowns. You will have to EARN your place in a team, ( unless you have @ €20 - €25 Million per year to buy your own team ) normally by racing in the WSS class, then WSB teams, and even then you still might not be picked by the MotoGP teams. If you have raced all your life and are aged 12 & 14, then you could try and enter The Red Bull Rookies Cup, ran by Randy Mamola, Alberto Puig & Peter Clifford to name a few. This is the best way to start. The world of MotoGP is not a job like so many dreamers on this Yahoo site seem to think. You dont just get out of bed one morning as a 20-30 year old man & think " Today, I think I'll race a MotoGP bike ". The riders you see racing at the weekends on TV have worked their entire lives to be as good they are. Some have moved across half the world as teenager's with their parents to fund their racing life's. They have EARNED their place. If you were going to ride a MotoGP bike, the world would know your name by now. The world is full off people who WANT to be a world superstar like Valentino Rossi, Casey Stoner, Troy Bayliss, Ben Spies, etc, but the truth is, we will never be. Keep watching and support the sport, from your armchair or better still from the race circuit itself, but as for racing in MotoGP, you might as well try and become a pilot on the Space Shuttle for NASA after only been flown as a passanger on a twin prop plane. Once. Saying that, it might be cheaper to become an astronout then MotoGP rider. I fear you, like so many who have asked this question before, are living in a little dream world. Sorry to have woken you. Good luck.