The key to good shooting is to develop a good, consitent anchor and tune your bow so that your shots all fly down the middle. Then the only thing left to worry about is elevation.

A lot of people do what they call instinctive shooting. Basically just looking where they want the arrow to hit and using The Force. It takes a LOT of shooting before you start developing the mind/body control to get your arrows to group well. Problem with it is, many simply don't have any talent for it. G. Fred Asbell is the high grand poobah of instinctive shooting and has two books on it: Instinctive Shooting and Instinctive Shooting II.

Another way is what we call 'gap shooting.' Basically setting elevation for your shot by holding the tip of your arrow higher or lower in relation to the target for different distances. Same basic principle you use for sights. This, I think, is a far better way for beginning traditional shooters to get off to a quick start and develop confidence much sooner than with instinctive.

If you can get ahold of the book Become the Arrow by Byron Ferguson, it'll get you going.