If you want to try KODI TV (and I think it's brilliant), you can try it out first on your PC before buying the Android box for the TV.
Bear in mind, KODI is just the player. You'll then need to set it up with repositories so you can watch Sky Sports, movies etc. There's loads of videos on YouTube showing you how.
It's a free download for Windows, so try it out and see if it's for you. The initial setup will take you an hour or so if you know what you're doing, and double that if you are a newbie like I was.
If you like it, then get a TV box. They're around £50 GBP for the basic ones, or £80-100 for 4k ones with more memory