After choosing which hardware to use, download the Plex Media Server application. If you have not yet created an account, this is a good time to do this. You will see a drop-down menu with a list of platforms to choose from, including Windows, Mac, Linux and a large number of NAS platforms. Choose the one that is right for you and download it to your device and run the installation wizard to install it.
Now comes the tricky part. Once you have installed the server, no app will be running on your system that you can use to communicate with it. Instead, you are dealing with the Plex Web App, a browser-based front end for the server that also acts as a media player.
Almost everything you could want to do with Plex can be done here, from managing users and setting up a server to watch movies or shows from any computer with an internet connection.
The first time you open the Plex Web app, however, you will be asked to log in to the previously created account. You can then create your libraries. These are media collections at the highest level, such as movies, TV shows or music, that you can browse. You can create as many libraries as you want, but in general you only need one for each media type.
However, if you have a collection of films that you would rather not share, you can create another library, such as Private Films. and keep that separate from everything else. More importantly, you can choose which libraries you share with others, a convenient way to isolate your more embarrassing guilty pleasures.