Well as Jared said you're 15, there's noway you are gonna get a body like his that young. Besides from that it's shooting for the stars just a little bit when you don't have any muscles and too much body fat. Make goals that you can actually reach otherwise you will just burn yourself out trying. Besides from that; anatomi.
Any you're still growing kid. Just train and get your body used to working out.
But if you really want to, you can buy his DVD's here:
http://www.gsprushfit.com/workout_dvds/