Three things: a Firestick connected to Wi-Fi or Ethernet and updated to its current software version, a player app from the Appstore, and an active IPTV line. That line is what actually supplies channels; the app just displays it. Your line comes as either an Xtream Codes login, a server address plus username and password, or a single M3U playlist link, and your provider gives you these details after signup or when a trial begins. Skipping any one of the three is the most common reason setup stalls partway through.

IPTV Smarters and TiviMate are both free, login-only player apps that run natively on Firestick and work with the same kind of line. Neither ships any channels of its own; each just reads whatever server details you enter and pulls the list from there. IPTV Smarters tends to suit a first setup because its login screen walks you through the fields directly, without much else to configure. TiviMate is worth trying afterward if you want more control over how the guide and channel groups are organized, once you already know which channels you actually watch.

Plan on 15-25 Mbps sustained for 4K and 5-8 Mbps for 1080p, per stream, not shared across your whole household's other traffic. Content encoded in HEVC, a newer compression format, uses roughly half the bitrate of older H.264 encoding for the same picture, which is why two providers can quote different numbers for what looks like the same resolution. At those bitrates, 4K runs about 7 GB an hour and 1080p about 3 GB an hour, worth knowing if your home internet plan has a data cap. If your connection sits right at the minimum, expect the picture to lean on your household's least busy moments to look its best.

A Firestick over Wi-Fi is fine for most viewing, but a wired Ethernet adapter removes wireless interference as a variable entirely, which matters most during live sport, when everyone else on the network tends to also be streaming at the same time. If you've already got a wired connection ready near the TV, use it, since it removes one more thing to troubleshoot later. If not, keeping the Firestick within clear range of the router, without walls or other electronics directly between them, gets you most of the same benefit without buying extra hardware.