It looks like you've done your homework so if you've heard this all before I'm sorry. My first suggestion is to find a good reliable feed store. I have a local store that is family owned and they are all really helpful. There is nothing wrong with ordering all your supplies, but having someone explain and demonstrate everything is so much better. There a quite a few in the Houston area and you can either check them all out or get some suggestions from other Houstonians. My other suggestion is to build a good strong coop. Keeping out predators should be the #1 priority. Good strong hardware cloth will keep out almost everything except bears, mountain lions, and sasquatch. Even in the city you get hawks, owls, snakes, and rats. Raccoons, skunks, and possums turn up in surprising places like suburbs. So, don't trust the twisted strand type chicken wire. As far as breeds go, your choices sound good, I wanted Buff Orpingtons but I got Barred Rocks instead and have been very happy with them. Anyway that's my 2¢. Good luck and have fun with your chickens!