[Gryphin]

I don't know if there are any Written rules. The unwritten rules are:
Romen Rule: When in Rome do as the Romans
Golden Rule: Treat others as you would have others treat you
Wiccan Reed: Anything you do, (positive or negative) will come back to you three times
Practical rule: When in doubt leave it out.
Use Lots of smiles
Note: I have broken most of these and at this point tend to keep my post to what I'm sure of.
Hope this helps