I'm sure someone more knowledgeable can chime in, as I don't hunt public land or hunt in Texas, but in my area you make sure you're legal (the state will put out a reg book detailing licensing, back tags (if required in TX), mandatory amount of orange (if required), legal implements and their seasons.
Once thats covered, pick your spot, park your vehicle (legally) and head out into the woods.
Keep in mind it can be a free for all on public land, so be sure to get in early, use a flashlight, be mindful of other hunters, and try to get the fuck away from everyone else. The further you walk away from roads, the better.
Keep your eyes peeled for other hunters in trees, and listen for whistles. I'd highly recommend a ton of blaze orange for hunting public land. If you run into someone, do a 180 and remove yourself from the area as quietly as possible the same way you came in.