Thanks for the advice so far. I went to the NMLRA web site and found a few clubs in my area (or close enough). I will check them out. Also, Kempton is close enough to me that I can go up there and see what I can learn at Dixon's in Kempton PA.
What about caliber? I've never fired a shotgun and I am wondering if I need to go with a .45 or .50 caliber flintlock to get used to the kick before going for something larger. Or, is a heavier gun more stable to fire? Or, I guess I should ask, is a .54 less heavy than a .50 since maybe the barrel is the same size (outer diameter) but the inside is larger inner diameter and hence a lighter gun...? I am lost here.