Question is what is the average setup and guides for this?
I don’t think there is an “average” setup because everyone’s hardware and needs are different.
What are you trying to “fix” with Plex/Jellyifn?
Will you still be using it your existing hardware? If so, what are the specs?
OS all depends on what you’re doing; I would think for the beeline you’d run something without a GUI and utilize Docker or some sort of virtualization.
Possibly, but for how ad laiden YT has become it’s a path I’m willing to take.