At the very minimum, ask them what net mineral acres and what royalty they are carrying for you. And ask if the well is pooling (how many net acres acres you have out of the total pooling acres) or an allocation well (how many feet of perforations versus the whole length) so that you can verify the decimal. I use the NADOA form, but you want to make sure that the clause that says “no terms of the lease may be changed” is on whatever form you use.