Selling Pro-Se in NY

I am interested in selling a coop on my own in NY vs. paying the $800-$1000 attorneys charge. When I bought this unit last year, the seller did the transaction on his own since the coop board sends an attorney there anyways.

Where can I get the RE Sale contract? Is there anything I should be aware of before taking this route? Trying to do this as cheap as possible, I am not making any money on this deal.