Using Linux is hardly a project anymore, unless you want it to be one. Plasma is just an interface, you can get many distros with it if you want including Fedora, Debian, OpenSUSE, Kubuntu, Arch, and so on.
You can pretty much just install Mint or Pop OS and go. There are a lot of options (I would argue too many) but you can ignore most of them as a beginning user. No one should recommend arch to a beginner and anyone who does should be shot.