Here'a a few questions that I was asked.
Are you saved and filled with the Holy Ghost?
What is your purpose of being a MOM...is it for the money, for the passion, or for the heck of it...LOL
What are your short term and long term goals for your ministry?
What do you expect from your leaders? The music department, pastor, etc can tell you what they expect from you but you need to tell them what you expect from them. This will eliminate any future confusion.
Have you ever held this position before, if so, what was the reason of your departure?