I have to make a marketing plan for a interview but no idea what to put in it

I have a interview on Wednesday for a digital marketing internship at a local company which is a Audio sweet shop.

They have asked me to produce a marketing plan for the interview and explained one of their new products.

However they haven’t given any other details, What level of detail should I go to and what fundamental things should my marketing plan include?

Thanks in advance for any and all ideas as I’m super confused!

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