Welcome to the board, Stephanie!
First, make a list defining the problems you would be anticipating. Long-term, NOLA-after-Katrina problems? Civil unrest? EMP? Terrorist-instigated zombie attack?
The basics are always the same:
First Aid
Water
Fire
Shelter
Food
Signaling
Having first aid supplies that you don't know how to use are pointless. Stock up on the basics. Do you realize how many bandaids you go through for a small cut when you're gardening? Contact your local Red Cross for CPR and first aid classes.
Without water, you're dead. What's your plan if the power goes off? Can you collect rainwater (TX probably has more info on this than any other state, research it) and store it? If you live near a river or stream that runs all year, contact your local water board and find out how toxic it is, and what contaminants you're likely to be dealing with.
Do you have multiple ways to start fire? What will you be burning? Can you store enough for a year or two?
Shelter can be your house, your vehicle, a tent, a tarp. The record cold for Houston was 5ºF, the high was 108ºF. How will you deal with these temps without power?
Food is the easiest thing to store, just remember that a load of frozen food without power will thaw faster than you can eat it. If you can grow food, you need to know how to store it, too: cool storage, dry it, can it, ferment it, pickle it.
If you plan to grow food, have a good soil test done (write ORGANIC on the request). No garden soil is perfect as it is, it's usually high in some things or deficient or totally lacking in other things. Learn what you need to do to fix it. Learn organic -- chemical gardening isn't sustainable.
There is a learning curve on everything, including gardening and raising/slaughtering/butchering animals. Jumping into it when you're really needing it is poor planning.
If you have house pets, what's your long-term plan for them? Children? Babies? Seniors? People close to you with medical problems? Is it likely that people would move in with you during a disaster? Visitors?
Do an experiment when you're going to be home for a few days: turn off your water, then turn off all your breakers except for the freezer. That should bring forth a lot of questions and ideas --- write them down.
Get used to thinking, What If...
Sue