I'll play around with this later, and then link the results for feedback.
I think if you feel particularly passionate about writing something then go and write that. The wiki software tracks edits/changes so I think there's not much risk in just doing whatever right now while we're reorganizing.
For role pages I think we're going to have a Strategy and (Game) Design sections that describe general strategies for playing the role, and guidelines how to include the role in setups or tweak or whatever respectively. Those sections will actually take thought to write, and we were going to prioritize roles in modbot first so that is a going to be a useful place to start I imagine.
I think @Phoenicks was tinkering around with setups formatting so I'm not sure if he has a general outline or formatting idea for those pages yet (i.e. what sections they're going to have), but just writing copy for pages for common setups is likely not going to be a waste of time either.
Something I mentioned earlier would be pages for game type/design concepts that could be delved into more beyond a terminology page like Bastard, Multiball, Mashes, Role Madness etc. If something there sounds like your jam then go for it I say.
It took me a minute to figure this out, but the easiest way to create pages is to search for them. If you wanted to create page for Bastard you would search for "Bastard" and then click 'Create the page "Bastard" on this wiki!' If you run into any issues you can feel free to DM me.