I like FAQs to have sections that address am area of questions, either in a linear list or as a tag in a wiki.
How do I connect to this game? (telnet, commonly used applications, less common applications)
What are advanced client features commonly used for? (Spawns, formatting, triggers etc)
Opening topics on roleplay online (posing, what is RP, ways that stories start in terms of player and staff creation and control, there is no winning)
Routine topics of roleplay (how to form groups, how the game system basics work, code used by players such as xp spends or requesting plot elements, PVE and PVP play styles)
Complex topics (cheating, complaints, advice on how to help others succeed and have fun)
Social contract on behavior
Game design notes (what is the purpose goals and limits of theme, code minigames, guidelines for character vs player action, why are policies the way they are in particular)
That sort of thing, so people have an idea where they want to look, and where similar unknown topics may be at.