What we currently have is this:
http://www.nexusatlas.com/tribes.phpI'm not sure what else you are looking for. "How to join one, how to leave" is pretty much like a clan. "restrictions on membership" is on this page I sent you. restrictions on "names / benefits" aren't there yes, so it's the only thing I see that we could add to what we have now. Honestly, rings & tribes are not on my personal priority of updates to the site. I would rather work on new sections for official clans, update subpaths information, update carnage section, create a past elders/primogens list, update Tutors list, create an ultimate gauntlet section etc.
YET!
If you want to help, you could write a small text about restrictions on names to rings/tribes and the benefits given to each, I.e. "clan bank ability", "clan chat ability" etc. If you write one I can easily add your text to the current section of NA devoted to ring/tribes. What I think we need to do here as well is put Rings/tribes in a place easier to be seen by public, right now it's pretty much hidden inside users list page.