If i was you i would look for a 3D or target archery magazine or book.Ask a PRO shooter.I'm not ,but have recently read an article in Bowhunter febuary issue about shooting form .you may find this at Bowhunter .com the web page for this magizine.I work on my form while shooting indoor 5 spot leagues.
There is a lot more to shooting form than some may think.
Your draw lengh if to long can cause bad form.So if that is not correct you are not helping the begining of the process.
Your local pro shop should also be able to help.