1) To be safe, I would suggest setting aside about $500 for the Fall semester. Another $500 for the Spring semester. There are several books (2-3) that we reuse, and the professors advise never selling your books as you will use them in your professional career.
2) I don't know if it'll be different for your incoming class, but for mine, the school covered the costs for our first drug test, which was done during some random class time. If a site requires any addition drug screens, we would then be responsible for the cost. For the background check, however, we all paid for our own. I vaguely remember the info being on an email I received from Tomeka. Costs about $45, and we do it through GroupOne. If you haven't received any info from her, hopefully you will soon.
3) Wow, the cost of the parking permit is not coming to me. It was definitely less than $100, though. $60-70? It'll be good for a full year and you just stick the sticker on your car. TWU Dallas has its own parking garage, and any spots that is NOT on the first floor is open to you. Although half of the roof (4th floor) belongs to UTD, but those spots will have UTD written on them. Parking is really heavily enforced, and the parking people are sort of rude, so you don't want to get on their bad side.