New comer looking for help to buy!!

Hi, new to home theater and read the frequently asked questions and that was helpful but a little overwhelming. My main room where I game and watch movies is a pretty open room. I have the dining room to my left and kitchen to my right. So sound would go everywhere. Sit about ten feet from the tv and my couch is sitting right against the wall. I just honestly don’t know what route I should go with 3.1 or 5.1. I have an Xbox x, ps4 pro and 4K tv. What I’m willing to spend on equipment is around 2grand. Any guidance or thoughts on this is appreciated.