Basically, aye.
Theres an app on there called downloader, or if it isn't you just search on the firestick app store and install it.
Whoever you get your iptv service off will give you a code to enter into the downloader app, to install their IPTV app.
They will also give you a username and password, so once the app is installed you enter that to get access to the apps content.
It sounds way more complicated than it is.
Careful which firestick you get, there's one of the new gen ones that doesnt allow iptv apps on it. Check which one it is in Argos and Google to see it it works for iptv.