It's also worth getting a remote app for your phone, if you don't want to use a keyboard and mouse or you don't have a suitable hardware remote. If you're using something like an HDHomeRun then you'll be able to install a simple PVR (personal video recorder) add-on that will integrate the output into the Kodi interface. Kodi also makes it incredibly easy to integrate live over-the-air TV channels. It's not limited to video, either, so you can also pull in music and photos to your Kodi setup. These include YouTube, Twitch and OneDrive, as well as some services provided by cable TV networks, news channels and the Smithsonian Museum.
You have to add sources of media, and there are a bunch of legal add-ons available right out of the box in the official Kodi repository. When you first set up Kodi it will be completely empty.