A Hunter Safety course, even if not mandatory, gives lots of good input.
Any of the clay games will help you, and a few lessons from a qualified instrustor are priceless.
Also, break out that well worn library card and look under Dewey Decimal System # 799 for books on shooting and hunting.
Also, I can occasionally be found shooting slightly north of the Potomac, try to catch up with me at PGC shooting Center in PG county and I'll run you through a basic course. Time's precious, but I'll try to spare a few hours. PM me and maybe we can set up something.
And get yourself an 870(HG)....