Showing a home as a Tenant

[Anna Stocks]

Hello Everyone! I hope this is the right place to ask this question. I rent a friends home (lives out of town) and she is going to sell the home. She asked if I would show the home and if I close it without a realtor she would compensate me. My question is if I show the home and advertise it, how much should I be compensated? What if I find a buyer, how much compensation should be given?  Thank you for any help!