How can I get an interview at Petsmart?

I applied to Petsmart a few days again,called today and spoke to a hiring manager. Luckily,they are hiring and might be calling for interviews next week. I gave her my name and she said she would give my name to the hiring manager. How do I go about getting an interview? Do I call again a week from now? When should I call? If I do get an interview,what should I wear? What questions do they usually ask?