Yep, I'd recommend joining an archery club. The members will be a good source of information about the type of bow you'll be launching arrows from and how to put your practice sessions together.
Have you given much thought to the type of bow you'll be shooting? If you go with the more traditional style of bow, like the longbow, your back muscles will play a very active part of the equation. Proper back tension helps to ensure good accuracy, as does doing everything exactly the same, each and every shot. Stance, how you hold the bow, how you draw the bow, where you anchor, release, etc., all come into play for consistent accuracy.
What I do to keep my back muscles balanced is to draw the bow with my off hand and then let down. I do this half as many times as I release an arrow when practicing, or every other shot. When it's wet and there's no place to shoot, I'll string up the bow, close my eyes and concentrate on my form as I draw the bow. Then I let down, which makes the muscles work double duty and helps to strengthen the back even more.