Plex Server

A friend of mine shares his movies and TV shows with me on his Plex server and I'm wanting to do the same thing for my friends. I'm trying to figure out my best option to set it up and I've looked at this link:

...but there's a lot of big words and it makes my brain do an angry. I started a small one with my laptop, but I'd much rather have something more dedicated. Anyone have any advice?