Good idea to get the language down.
One book that really helped me is Art of Mixing by Gibson:
http://www.globerecording.com/books/aom.html
That website also has lots of cool videos.
Behind the words are concepts and the concept of placing instruments/sounds in a 3D space (and then 4D if you add time to create a dynamic story)is key for mixing. But, then, the mix also must sound good in mono, which is a real challenge.
I close my eyes to help visualize sound in space.