@LukeAlmighty
On KDE Manjaro, you can easily install Nvidia drivers via the Hardware Configuration menu in the System Settings. Don't know how this would work in other desktop environments. Haven't used anything besides KDE for a while.
As for setting up various PC games, Lutris.net should be your first stop, especially if they're older games.
For Epic Games and GoG, Heroic Launcher works really well.
There are various other tips and tricks when it comes to Linux gaming, but you should start with baby steps for now.