As other said, arch may not be for you. But I would recommend looking at KDE Neon too, it’s Debian based, with KDE as desktop environment, which is nice coming from windows. Whenever you encounter installation instructions about ubuntu, you can do the same on it, when with Fedora or arch you’ll be left alone figuring out how to install your stuff.

And my biggest advice is: take notes of what you do on your computer. EG, how did you install x our y software (Flatpak, command line, .deb package etc), which commands or software where useful for X problem. It will help you troubleshoot later or uninstall things you don’t remember his you installed them first, basically learn how linux works.

Right, it’s still in dev. But could be something to look at, in the future.

Personally, I have a GUI-less server that is connected to my lan running jellyfin server and an nvidia shield plugged to the TV with an alternative launcher to get rid of ads. That way, the server consumption is low and always on and you get a good interface and a remote for the TV.

If you really want a Linux device plugged to the TV, you could look into Plasma Bigscreen, a KDE made for TV.