The breech is the back end of the barrel and its where you insert the shell. it has nothing to do with the spread of the pattern made by the pellets. Choke is the constriction inside the muzzle and that is what affects the size of the pattern. Recoil is a combination of a lot of things. Lighter guns kick more than heavy guns. Some ammunition kicks more than others because of speed and weight of the shot. Some guns don't have soft recoil pads, just butt plates. How you stand, and how well the gun fits you also affects felt recoil.
Good advice on getting an inexpensive pump with multiple barrels. Lets you try out lots of things and discover what you like. Hunt some waterfowl, hunt some upland birds, punch some paper with slugs and buckshot and try your hand at the clay target games. I'd be willing to bet you'll find something you really like.
Edit: Stubble jumper, you beat me to it