There are several ways to approach gluten-free from being aware to actually being certified. www.glutenfreerestaurants.org has a front and back of the house training program.
If there is a gluten free menu and a level of competency please market your restaurant to the gluten free community. Texas has quite a few very active groups! Google gluten free support group in your town to find a willing customer base. Advertise nationally for vacationers on www.glutenfreeonthego.com and glutenfreeregistry.com. They will list your restaurant for maximum exposure.
If you are going to the NRA I will be at the Swiss Chalet Fine Food Booth on Sunday. They have HACO's gluten free soup base/roux and sauce line that is certified. Ask for Ronni- I'm their dietitian and do their food allergy training.