My only interview was laid back and began by a store tour. I did not need to prepare for this interview at all. It appeared to have little to no structure and all it consisted of was chatting to another human being. HOWEVER, I would not suggest going in unprepared. The second store that I worked at required and interviewee to interview with 2-3 managers. Each store is different and every manager is looking for different criteria for their store.

Online application or in store. Highly recommend going in store and introducing yourself to the manager. Can fill out application in store. Be polite and energetic. Smile a lot and be genuine