[CentOS] An odd X question

I've got a headless server running CentOS 7. I've got a user who wants to
run some graphical software on it, and view using x forwarding. What I
don't have clear is how to set this up. I've just installed
xorg-x11-server-[Xorg, common]. I assume I need to run X, but I don't see
running this in runlevel 5.

Thoughts?

     mark "and why is it called xorg-x11-server, when in X terminology,
              it's the client?"*

* Which I always thought was bass-ackward, but...