New to all this and looking for recommendations. My primary goal is to get something that I can set up on my amazon fire that's easy and user friendly. Mainly interested in watching live sports, especially every NFL game when the season starts. Thanks
Unfortunately you will likely have to try a few services and methods of watching before you figure out what works best for you.
With a FireTV, you will need an app of some kind. Many providers now have their own, dedicated APK that makes life pretty easy. I know Vader has a good one, haven’t tried any others but have heard good things about Gears/Reloaded, Epic and a few others. Check out /r/IPTVReviews for some ideas. The reviews by /u/Greencon10 are really thorough and worth checking out.
Alternatively, you can use apps like PerfectPlayer, IPTVSmarters or STBEmu with just about any service. Takes a bit more tinkering but may be a better experience for you.
My recommendation is to head over to /r/IPTVResellers and ask for some trials. Most are free and most resellers will help you through the setup on your device. See which services you like the best, then pay for a month. Never buy more than a month until you are sure you really like the service and NEVER buy more than 3 months at a time! These services can come and go.
Good luck!