One of the first that has to be learned is form. It'll take a while. Then, I really believe the next thing is getting the right/left impacts correct. This will be easier said then done and will still have a lot to do with form. Then learn the trajectory of the arrow.

Of course in the beginning use gap shooting and know the point on spot. Once you know the point on,you usually will not have to aim much more then about 20 inches below that at targets below that point. For me usingmy recurve the point on is about 60 yards, at about 30 yards I have to aim about 18 inches below the target I want tohit. If I shoot over 60 yards, I have to aim above the target.

Bob Wesley has a pretty good system for gap shooting in his book. I'd sugest getting it. He's still alive I believe so maybe ask to have it signed.