I have created a Google Docs here:

https://docs.google.com/document/d/1...it?usp=sharing

You should be able to access it. Feel free to edit it or suggest modifications! (my English is far from being perfect)
It is pretty incomplete for now, but here is what I thought as main guidelines:

- Introduction
- Beginner's guide (for very beginners)
- Global FAQ (misc questions about any aspect of the game, divided in categories)
- References (chat commands, locations, and eventually weapons guides)
- Credits and conclusion

I started the Beginner's guide, and included several pics. I'll probably add more during weekend.