Lease agreement with the owner can be found pretty easy on the internet. Ours is pretty standard.
Lease rules should be determined by the group and for the group. Different goals, ideas, etc will determine different rules and what works on one place might not fit another group. Have a work weekend and sit down and hash out some of the expectations from the other hunters. Draft a list of rules and stick with them the first year. Rules shouldn't be changed until the next year and shouldn't be driven by just one person. The expectations of the group that is getting on should determine how to handle the typical arguments; hunting each others stands, feeding, work weekends, over lapping seasons, off season activity, etc.