I would ask
1. To whom would I report?
2. How much will I be expected to travel? (if there is at all)
3. How would my performance be assessed?
4. What will be my main responsibilities for this position?
5. What are the goals for this department and how do they relate to the company as a whole? - this is an important question - it concerns you and it shows your interest in the company.
Of course don't ask too much questions
