What are store clerk's duties, for example a clothing store?

I'm 16 and I want to apply for a job as a store clerk, at the mall, like forever21, know style,ect any clothing store in the mall. What do they do? Do they do what cashiers do, if so I don't want to be a cashier. Is it hard? What are some do's and don'ts? Btw do I have to have a work permit?
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