Linux Mint Plex+Minecraft server

[Buachspeck]

I have a desktop using a Intel Core i5-3470, with 8GB DDR3 RAM, a 128GB SSD I want to use as a boot drive, and 2 500GB HDD that I want to store my Plex Library and Minecraft server on, I have tried this and googled all over the place and nothing gets me a coherent tutorial on how to do this, I can't seem to get Plex to recognize any folders on the HDDs when Linux Mint Vera is installed on the SSD, currently the computer is running windows 10 just as a proof of concept, but I am running into issues and want Linux Mint instead of Windows.

Can anyone link me to a tutorial for beginners or directly help me out, I am willing to hop into a call to figure this out.