hold it properely, the left hand supporting the side of the ball, right hand angled at the bottom of the ball and the right arm should be shaped like an L , gently release the ball , but do not push it, use your legs for power to shoot a longer range.  and aim for the back of the rim with a proper arc of the shooting, and finally do lots of practice.  i'd suggest you do the aiming at back of rim at a close range, probably from the side lines.  and do a lot of practicing from the freethrow line when you think you've mastered the first part, and then you can try from the 3 point line and lastly you can join Lakers and of course i'll be your agent. :]