As said, the best thing is to have it started once a week to keep lines fresh and fluids moving thru.
I'm guessing it doesn't get too cold in Texas, but it's still best to keep a full tank of gas damn near to the end of the line to prevent condensation. Check tire pressure and make sure it's at the appropriate level, wouldn't want to come back to a car with flats. Also, if it is going to sit for extended periods of time without start ups I'd suggest disconnecting the battery.
Latemodel Restoration sells a disconnect switch for 7.99 that saves the hassle of removing cables etc.
79-04 Mustang Top Post Battery Disconnect Switch by 50resto at LRS - Same Day Shipping!
Also make sure your interior is clean and free of anything that might attract animals or mice...putting some moth balls around the car NOT in the car will help deter them. Before leaving the car (sad day) check fluids, wiring and window trim to make sure everything's in top shape.
Give the car a good wash and treat your black plastic pieces to help prevent cracking while the car is sitting. Also throw some tire wet on the sidewalls to do the same.
And make sure your steering rack (wheels) is/are straight when you park the car...don't leave the wheels turned at any degree or it might cause damage to the steering rack.