I switched to Bazzite for my new gaming PC and it’s worked great without any major issues.

The only problem I have is that I’m still not sure how to install software that isn’t through flatpak or package layering.

I’m pretty much the same as you. A lifelong Windows user who got fed up with the direction windows is going. I just recently switched to Linux for my new gaming PC and I haven’t had any major issues. The only thing I still haven’t figured out how to do yet is modding.

As for which distro to use, I would recommend something that comes with the graphics drivers already installed to reduce any initial setup difficulty.

I use Bazzite on my machine. It’s a Linux gaming distro which comes with all the stuff you’ll need to get right into gaming. It’s an immutable distro so it’s pretty difficult to really mess it up but it also makes things a bit more difficult to install anything that isn’t a flatpak.