Well, you have to be a resident in one of the 50 states. Since you've left FL and have to get a TX DL, and you said "when you get more established" in TX, I would argue you're a new TX resident. You're fortunate in that FL has no state income tax and doesn't seem to be aggressively looking for its recently departed residents, contrary to NY, MA, MI and a few others. Your stated intent is a big deal, along with getting a driver's license, paying whatever taxes you may owe to TX because of your job, and registering to vote. You don't have to spend x number of days in TX to claim residency there since your job requires you to drive out of state a lot. Again, I think you've become a resident of TX.