You start at your nearest to you competition match, even if it's at local non-sanctioned match. You may shoot USPSA matches forever without becoming a member, but not IDPA (sanctioned clubs require membership after the 1st match). Call the match director, tell him you are new, and ask if they require a training class before your first match. Bring what gun and gear you have, and jump in. GSSF is a really good start, you must have a Glock, as all stages are from the low ready. Steel Challenge is next best, especially with a .22LR, as it's from the low ready also. There are no reloads in Steel Challenge, each string is only 5 rounds... Clean.