Practice, practice practice. It took me a good two years to hit things consistently up to 25yards.

Start with the basics. The release is beginners worse issue. Don't try to start shooting at 20 yards. You will struggle quite a bit for years to come.

I read a book by Brian Sorrells I think the name is, and I believe his regemen he has listed would get a new shooter up to speed faster than any other. Problem is its boring.

You start at 3 yards. And you shoot and shoot until you can hit 1.5" circle consistently 10 arrows. You move back another 2 yards and do the same. Each day practicing moving back and forth between 3 and 5 yards. keep doing this all the way to 20 yards. Each day for warmup do some blank bale shooting. Closing your eyes, watching your form, concentrating on keeping that bow arm from not moving, bow hand loose, concentrating on your release and follow thru. Concentrating, that all the wieght at full draw is completely on your back. Keep pulling that elbow back until that string is gone.

If you hand is right beside your face afte the shot, you plucking. If your bow arm moves at the shot, its bad, or you may be overbowed.

I suggest staying away from anything written by Fred Asbell. His technique about injured me.

Another book to study is become the arrow by Bryon Fergonson.