What you need to ask a photographer before shooting

  The idea or theme behind the shoot       
What clothes are needed or provided
Will there be a makeup artist or do you need to do your own.
If you are getting pictures how long will it take
Can you bring someone with you. ( If you are a minor a parent or guardian is required! )

Photographers generally do not like distractions on set and guests caught backstage at shows are usually asked to leave the building.  Even in a venue where a photographer does not mind, the guest should keep out of the way ( out of sight out of mind)

  If getting prints what will it cost later to have copies made.  

Photographers usually do not allow others to edit or print there photos, because if it is done poorly it reflects badly on them.