Getting started with PatternFly 4

I’m trying to get started with PatternFly 4, and I really can’t make heads or tails of just WHERE to begin. I tried following the step to clone the patterfly-seed project, but when I do that and run the server as the docs say, nothing works.

How do I get this framework installed and ready to start creating some content? And how to I go about creating content dynamically on the back end? What does everyone use? Javascript, Ruby, something else? I ask because we use Red Hat Satellite in our environment, and I see that they use alot of Enhanced Ruby (erb) files underneath, so I’m trying to wrap my head around how to program the pages we want/need.