You have to figure out which resorts you would like to stay at, its good to have a few picked out in case the one you really want is not available. Then look on the rent/trade thread for someone who has enough points to cover your trip. Contact them and they will check to see what available. The point owner will need your name/address/phone # and I think DOB - not sure on that one.
When I rent my points out I always only accept Paypal for the payment.