No, you are responsible for making your own arrangements. AFIT does not pay for your room and board and will be your responsibility. Every other week you will receive an electronic deposit to your bank account for certain pay. Yes, you will have to complete a W-4. You must make your own arrangements for medical coverage.
Civilian attire is appropriate.
Dressier clothes may be needed for particular events. An official transcript is required. You must arrange it through your own university. You will be working for an AFIT professor and your job will be individual to that professor's needs. You may be working in labs, conducting research, collecting data, or writing programs.