Using Plex Without Internet Connection

How can I set up my server to where it only needs my router on and running. I’d like to be able to use it without having an internet connection as my internet tends to go out a lot.

Server Version#: Latest
Player Version#: Latest

Here’s another walk-through that has some good information:

That is definitely quite a tutorial! I will definitely try to set all of this up in the morning! Thanks for your help my guy.