I'll post some pages here for game design docs and theory.
Some game design docs are very detailed, and some are really simple. For just starting out with game design, I think it's best to use something simple, build a few games with it, then move on to the more complicated ones.
Here is a link to a very simple game design document, that has all the elements necessary for a great game.
http://gamedesign.wikicomplete.info/game-design-document-template
