The entire manual for Vray for Sketchup can be found at
this link. This is a very in depth manual. In fact, it is better then the one that makers of Vray put out themselves. You should definitely have a read. You will see that Vray for Sketchup has all the power of Vray with the other big (more expensive) render programs. The only thing that will limit you now is the modeling capabilities of sketchup. They are not nearly as powerful as some other programs. Fortunately, the rendering with Vray is top notch.