As the parent of a college student, may I strongly suggest visiting the campus? There is nothing that answers those questions and relieves those anxieties quite like seeing the place firsthand. Call the Admissions office beforehand and ask if there is someone who can give you a tour. Often a current student can show you around and give you the lowdown on which dorms, programs, food services, etc. are the best.
Also, once you apply and are admitted, you will be given a ton of information about housing. A quick look at the website
Student Housing Services reveals that you can request your preferred dorm, but like many things, the earlier you apply, the more likely it is that you will get your first preference.
If you can't visit for some reason, I would still write to the admissions office with your questions. They have lots of stuff they can send you, and maybe they can put you in touch with students who can answer questions.
When my son was applying for colleges, he received phone calls all the time from kids in his major asking if he had any questions.
Good luck.