Mary Beth,
If you do not have a compelling reason to sacrifice your property (and give up your profit), I strongly suggest you look into updating it and selling it to someone who is going to live in it, rather than an investor.
The Real Estate market in North Texas has fewer homes for sale than anytime in the last decade or so. This is fantastic news for sellers. It means homes are selling faster, and for more money. Any competent Real Estate broker / Realtor can help you determine the fair market value of your home in its present condition, as well as what it should bring in a fixed up condition (generally substantially more $).
As for your question concerning mineral rights, I strongly suggest you strip those out of the property and sell them (while you currently own the property) to a family member you trust, or and entity (usually an LLC) you own. Then, when you sell the house, you don't have to deal with the mineral rights issue b/c there are no mineral rights to convey.
If you need help determining your property's fair market value (both in its present condition, as well as in a rehabbed condition) find a Realtor who specializes in your area. She will help you determine those values for free. When you talk to her, tell her what you want her to do. She'll know what you are talking about (this process is usually called "determining a CMA" or Competitive Market Analysis. Some Realtors call the process "determining a BPO - Broker's Price Opinion. Regardless what you call it, it's all the same thing.
You can easily find a Realtor who knows your area by a) driving the neighborhood where you property is located and looking for Realtor signs in yards of homes that are listed For Sale. You can also look online (e.g. http://www.realtor.com) by entering the neighborhood / Zip code where your property is located and call those Realtors.
Probably the best fast method I know to find a Realtor knowledgeable about your target neighborhood is to look in the yellow pages / online and find a BROKERAGE (Century 21, RE/MAX, etc.) that has an office as close as possible to your property.
If you have trouble or questions with any of this, please don't hesitate to contact me. I'll be happy to help you determine a CMA and walk your property with you to discuss what a rehab might look like and the returns you might expect to get from doing one. Projects like yours have been a big part of my business for the past 10+ years.
Talk to you soon!
-Greg
Greg Wilson
The REI Mentor