ibreathemusic.com
That's a link to one of the best free online "chord scale" tutorials I've seen, plus the rest of the site has many other great user contributed topics, including but not limited to theory.
Of course, I forgot to mention that the lessons and tutorials here at GT are top notch, but if you don't have a subscription... :cool:...perhaps you can use some of the links I provided, and if you get stuck, come here to the forum for guidance.