I'd recommend https://www.seedsforchange.org.uk/resources and https://radhr.org/ for general organising resources.
My co-op worked on https://transformyour.work/ which is more specifically focused on worker's inquiries but there are some useful general resources in there too.
https://thedecider.app/ helps people decide on a decision-making process.
This Community Canvas is useful for clarifying purpose: https://docs.google.com/presentation/d/1WpQ0N0l4LBXFi4A_hwT0E2LUQSoxAhq3iRlTqyzGQio/edit#slide=id.g26353718b7_0_0