There really isn't one, they just show you how everything works. You need to be able to lift things and smile to customers, all the usual stuff. As long as you don't have an attitude you'll get hired.

Not very complicated and very professional. Standard questioning about previous experience, talents, and skills. Generally reviewing job duties and ensuing abilities to perform such duties. Overall this position is considered for many to be a part time job so the interview is less of a question of if you will receive an offer, but ensuring your abilities and skills for the position.