There are some pretty good reference books out there that can help you figure out protocol. Here's a few that I like:
The Etiquette Advantage in Business by Peggy Post and Peter Post
Gentlemanners, a set of three books by John Bridges and Bryan Curtis
Essential Manners for Men, by Peter Post - I really like this book.
And for those with kids:
The Gift of Good Manners by Peggy Post and Cindy Post Senning, ED.D.
The Guide to Good Manners for Kids by Peggy Post and Cindy Post Senning, ED.D. - a book written for kids.
These are just a few "manners" books that I have in my library. I especially recommend the two books for kids. I think one of the most important things we can give our kids is a proper respect for manners.