Prefferably a guide that only teaches the stuff I will need for RGSS 2?
I know most of the technical words (properties syntax etc.) from a different programming language that I've already learnt and nearly masteered so they aren't a problem either.
I suggest you take a look at this sticky: http://rmrk.net/index.php/topic,1723.0.html
A lot of the tutorials listed are specifically directed toward RGSS but they'll still help for the important stuff since the only significant difference is the library; I don't know of any good ones directed at RGSS2, but just learn Ruby. It's a better way to go about it in my opinion.
Once you know Ruby, it is easy enough to familiarize yourself with the library of RGSS2. Just look in the Help File.
Thanks modern, I suppose the only differences are pre-set functions and variables? (Between RGSS and the RM version)