Patricia,
I am a Reeves County minerals owner and have been reading this site for several years. I would like to recommend that you consider getting professional advice. Wade Caldwell, a Pro member on this site helped me negotiate and tweaked my oil and gas lease with outstanding results. There is lots of details that can make a big difference. Wade knows Reeves County and can likely make a huge difference to you.
Here is a link you may find useful.
http://www.mineralrightsforum.com/profile/WadeCaldwell
PS: I see Clint Liles replied to your post also. He is a wealth of information and always helpful to folks posting on the site. You came to the right spot.