Once the Installation GUI comes up, I'm going to customize my installation. Desktops are nice to look at from time to time.
It's completely unneeded, but whatever. I want it.
So customize your installation and select "Server with GUI" else select "File and Print Server" for basic file share functionality in a CLI.
Select Done.
Select your partitioning, the basics are fine. Click into and then click done.
Lastly click "Begin Installation"
Set your Root password and follow the onscreen guides. Create additional users if you need them. (Which you should. No one should use the root account for everything)