Clients always ask me etiquette questions, and they are ALWAYS good questions. Some really depend on the situation and obviously, your own opinion about the specific issue. Sometimes, I have to ask multiple questions in order to figure out what the right answer will be for that specific client. Here is a good comprehensive list of the top 24 etiquette questions by Real Simple to at least guide you through some of the common ones.  
 
(photo by Carlie Statsky)

Let us know if you have any questions that you can't find the answer to on your own! 
 
Cheers,