Perhaps there is already one that I have not seen, but is it possible to construct a general etiquette guide for the newbies which can be clearly be made aware of. From my own experience, it isn't always straightforward to separate IG and OOC when you are new to this style of game, and can be easy to take offence in some situations.
I believe now though, I have a very good understanding of the separation of the two, but it was not without persistance and learning. It doesn't always come instantly to newbies.
The guide should also include a section for how the experienced players should treat newbies.