I know there are some links missing, because there are soooooooooooooooo many helpful things out there. If you have more links feel free to share it, I am suprised you didn't yet.
Well actually, it's just a bunch of links. But yeah, I guess you could consider Wikipedia everything you need to know, not the actual individual articles that are useful.
If so...
http://www.mobafire.com/league-of-legends/forum/build-and-guide-discussion/guide-making-help-and-tutorials-22667
The above link has everything you need to know...
Interesting to see that this very basic tutorial isn't included in that compiling of links:
http://www.mobafire.com/league-of-legends/wiki/mobafire/using-the-guide-editor-mobafire-how-to-series