I agree with Laurajean to keep it simple and honest. However, make sure that you do things that protect should the renter not come through. For example, never borrow points to make a reservation. I would also try and rent the points soon after your use year rather than late in your use year. That way if the renter does cancel it would give you plenty of time to bank your points. Another suggestion is to be sure that you require the final payment 45 days before they are checking in so that if they don't come through you can cancel the reservation without the points going into "hold status".
I never use a contract and would suggest not using a contract. We have rented before to stay at the Manhattan Club from an owner at that resort and also have rented our points and never used a contract and didn't have any problems.
I would also suggest not accepting less than $10 per point. I would post how many points you have to rent on the Rent/Trade board and have people e-mail you that are interested. You will find that you get many requests for your points.
Good Luck!!!