I’m confused on how to make a ranking system for my server. I want to have certain player models, name colours and weapon loadouts for each rank, but I can’t see any option in the users file to set that.

To do all of those things easily your gonna need three things.

URestict - For restricting weapons to groups

ULX - Creating groups

UTeam - Different names and colors for teams.

This one also : http://forums.ulyssesmod.net/index.php?topic=3650.0