I'm sure there's an authoritative post somewhere but IIRC:
- Rich set up the website to show off those Gaming articles. He started OotS to draw more traffic for those articles. The forum came later.
- Those articles are it; there's nothing else written by Rich regarding gaming on the forum.
As for the rest -- if you have specific questions or seek general advice regarding a particular system, you only have to ask. Also, take a gander at the Forum Rules to get a better idea as to how the forum works.
Welcome