I'm going to bring a few of the old guides that I made over to the new site.
As an example, here's what I did with my Oblivion mage class guide.
Since guides are all unified per game, I'm going to set my overall guide under a header 2 block, then use header 3 and 4 for sections and subsections. I'll probably pretty it up at some point, but the editor doesn't totally reflect what the guide looks like when it's posted so I might not bother for a bit.
If anyone has recommendations on a better way to do it, please feel free to comment.