Once you get your rig set up...always buy games on sale, never full price. There are bundle sites like HumbleBundle that sell a lot of games on the cheap. Invest in a nice controller, keyboard, mouse, screen, speakers, and chair. I know it kinda goes without saying, but you should go for higher quality on things you use heavily or daily. It might seem steep for what it is, but it will be so worth it when you're not having to replace things as often and you can enjoy strong controls, builds, and comfort for your hard-earned money.
I would avoid any Razer products like the plague; they've got a myriad of hardware issues and aren't worth your time. You can get a Xbox for Windows controller and it's compatible with everything natively, and it's not that expensive. Don't forget you can SteamLink to stream your PC games to your television, if your connection is good!