Depending on what you hunt, where you hunt, consider a smaller gauge, lighter shotgun. Caveat... you can go too light and find that you have a bruised shoulder.
My personal favorites are 20 gauge double barrel shotguns (O/U & SxS) that weigh around 6 pounds. I can miss birds with two shots just as easily as with three. For pheasants, on easier terrain, I will carry a 12 gauge O/U that weighs about 7.5 pounds. With both gauges, I am almost always choked improved cylinder on the first barrel, and modified on the second. Late season hunting might see me use a tighter choke. For a pump or semi automatic, consider using modified choke.
Local chapters of Pheasants/Quail/Grouse Forever are good places to meet like minded hunters, and some states divisions of wildlife offer special hunts for new hunters. A Group like NAVHDA (North American Versatile Hunting Dog Assoc) is an excellent place to learn about training dogs for upland hunting, as well as meet people who enjoy bird hunting. Caveat, versatile dogs are addictive.
Give your local fish and wildlife department a call and ask them for nearby areas to hunt.
I hope that helps.
SGH