ive never been a fan of wheelies as i never managed to go for long but heres afew steps:
lower your seat to the bottom
put it in the smallest front chain ring
middle rear gear
slide to the back of your seat
move forward so you dont wobble then as you press forward on the pedal lift the front you dont have to go nuts just do both at the same time and youll feel it lift
once your use to this movement pedal abit more so your moving keep the speed up as the slower you go the harder it is to control
once youve got use to that you can start nailing the balance point (i never got there)