Here are the documents you will rely on during your Board of Directors tenure.
Duties of a Board Member: Jacobson Jarvis has put together a great overview of the duties of a board member. The 3 main duties are (1) Good Faith, (2) Loyalty, and (3) Care. This paper has an informative discussion of each duty -- see pages 3 & 4 specifically, but the whold document is of interest.