12? You'll also want the shop to check your draw length, since that will also likely have changed since you were 12. A competent shop (not necessarily one of the big stores like Cabellas, etc) should be able to get you squared away with no problem.

Like you, I got into bow hunting to lengthen my season. Funny thing is, now it's my primary hunting season. Gun hunting lost most of its appeal for me, mostly because the immense hunting pressure during gun season really messes up the deer patterns. Bow hunting will open up a whole new world to you! In many places, you have most of the woods to yourself during early bow season.