I recently was hired to write an employee handbook for an Internet Company. It was tough doing for a company I had no experience with. For you it should be a whole lot easier. Your past experiences should lay a great foundation for an Employee handbook. For instance, no matter how long I would work on an Electrical contractor's handbook, would I ever think of saying "no cigarette butts in the shrubs." My only advice is keep the entire book as broad as possible- for instance "Respect the customers home as if were your own."