(Well, I can't think of something more to say about this.)
(Well, I can't think of something more to say about this.)
Tak a page which is formatted the way it is felt other pages should emulate, and start listing each part as a rule.
Look at some of the older, larger wikis and check if they have MoS and copy what works for you. Be sure to give credit to each part of your MoS which is based upon another's MoS.