i cant emphasize this enough...start small. a few inches is perfect. DONT GO BIG.
go somewhere alone where you wont be embarassed to do small little wheelies.
a wheelie really isnt any type of rocket science, its practice. take an entire day and concentrate on having the front come up a few inches and back down. after a day or so of practicing that concentrate on clutch control and keeping the wheelie going, once the wheel comes up, just FREEZE your throttle hand, the bike will stay in the air and eventually come down, do this for a FEW DAYS
when your finally done with that concentrate on SLOWLY ACCELERATING while in the air, and you can ride wheelies for as long as the bike will let you, eventually youll learn back brake etc but this will keep you busy for the summer.
DONT GO BIG, start small bro, or you WILL fall.