tas here, the founder of Nocturnal Gaming. For a while, we’ve been playing around with the idea of making a tutoring/instruction site for gmod. We made a sub-forum for it on our main forum and people have been slowly adding stuff to it for the past few weeks.
We have just bought http://www.gmodschool.com and have moved the posts over there. If you would like to give your expertise, or if you would like to learn how to build better, check out the site.