First and foremost, you need to already be running Plex Media Server with your media setup and ready to go.
To follow along with today's tutorial, you only need a few things. And if you're already using Plex, you'll benefit from the great unified Plex experience that you get on all your other devices including your computer, mobile devices, and everywhere else Plex is supported. Rather than jump through those hoops, however, you can now tap into your local media using Plex Media Sever. The Fire TV and Fire TV Stick have pretty decent hardware (especially for the time of their release) but it's far too difficult to get local video files on your Fire TV without resorting to using an Android developer kit and some tricks to install third-party apps like Kodi Media Center. The Fire TV and Fire TV Stick have long seemed like a powerful tool in want of something to do.