Here is the information on how to write for SSC. It's pretty basic, and Steve tends to ensure the articles go in clean and that sort of thing. He's cleaned up some of the articles I've submitted in the past.

http://www.sqlservercentral.com/other/writeforus.asp

As to what to flesh out... maybe writing down in paragraph form some of the gotchas you ran into. Also, a screen shot or two showing a tricky point in the configuration usually goes over well. Basically, ask yourself the question, "If I was reading an article on this, where might I want to see a picture of what the author is talking about?" That's been the general rule I've applied whenever I've written an article for SSC.