Aside from googling for sample lease contracts, I don't know. One thing you may try is to look for local landowners and timber companies that do lease their land, and see if you can get a copy of their contracts.
I have a copy of a book called Hunt Club Management Guide by Wayne Fears, and on pages 130-131 there is a "Sample Land Lease Agreement." I got my copy of the book a couple of years ago on eBay, and there's a copy there now with a starting bid of $3.99. Or, you can get it on Amazon for $13.70.
Beyond that, I'll say "welcome" to the D&DH forums. I hope you get the answer to this question and many more in the future.
When the Everyday Hunter
isn't hunting, he's thinking about hunting, talking about hunting, dreaming about hunting, writing about hunting, or wishing he were hunting.