Buy a TV made in the last two decades with an HDMI port
Take HDMI cable and connect it to GPU and the other end to the TV
Buy some cheap pos wireless mouse and keyboard so your legs don't have to support your 300+ lb body weight while you stand in front of your tv for a few seconds to log in
Launch game and use wireless controller of your choice
Wow couch gaming problem solved. This genius here worked up a solution on day 0 of his first computer build