Welcome!

Hmm, one unspoken rule I can think of is regarding the tab function on this forum. It's a pretty unique set up, and very helpful. Some RPs you will see listed in their individual rules section: "Don't post in the IC or CHAR tabs until approved in the OOC tab." However, not every RP lists this rule, but I think it's still kind of expected. That's the only thing that comes to mind. 

Anyway, enjoy your stay!