Sainsmart Tutorial and Extension Shield Newby Question

I just got a Sainsmart Nano V3 starter kit and find that the documentation / tutorial is nearly worthless. Can someone guide me to a good tutorial for a beginner and how to use the I/O extension shield that comes with the starter kit in conjunction with tutorial experiments? Just documentation on the pinouts of the I/O extension shield would be a tremendous help.

Thanks for your help!!!