I strongly suggest you wait till at least you have a pooling order and a well proposal from the operator.
I also believe you will make out much better holding on to the interest, but if you must sell a sites like Energynet or Oil and Gas Clearinghouse will generate a higher price. This is due to the many buyers who will look at your interest and ensure a market price for your interest in a competitive environment.
My many years of buying and selling interests suggests these platforms more than cover their fee.