If you are buying one, try to get one that feels good and you think fits you well. Google shotgun fit. also do some research, get a quality gun. If you read about the same gun having the same issue from multiple people, i would find another gun. Don't buy something because its on sale, buy it because you know its the one for you.
if you are just going out with some buddies then just go have fun and don't fret, its a ton of fun. I can't shoot mine enough, which is due almost entirely due to the fact that ammo although isn't exceedingly expensive, isn't cheap either.
for a while my favorite type of shooting was long range rifle shooting, but once i started shooting clays i found that to be much more entertaining. i still like rifle shooting, but shotgun shooting is very fun as well.