[Buckshot]

It should be stressed that one of the single most important aspects of your potential for success in ANY of the three disciplines isn't gauge, or brand, or action style, but how the shotgun FITS you. This will determine how well it shoulders, points and swings. Which equals hits.

This is more involved than you might imagine and almost impossible to cover except in person. You can ask for help at a GOOD gun shop that does a lot of shotgun business, if one's available, or you can ask for help at the local T&S or SC range. Now of course you're going to have to deal with a myriad of self-proclaimed experts - like anything else to do with guns - so you might want to find some books on the subject (take note that I did not say internet) and educate yourself just enough on the subject of fit to be prepared to sort out the advice you get. Best of luck!