The following resources are available to Mistweaver Monks for Legion:
Guides
PeakOfSerenity - A Monk site for Monks, by Monks
WoWHead - WoWHead's guide for Mistweavers, maintained by Garg
Other Resources:
Peak of Serenity Discord - The Monk server of Discord
The latter pages of the Legion Mistweaver Discussion from the beta can be useful.