What should I do to prepare for my first interview?

I’m 16 & I applied for buger king so I could help out with my mom . She’s currently struggling paying the bills & being able to buy groceries after the bills are paid so I decided to try to get a job to help out, I honestly didn’t think i would get a interview so quick but I applied one night & woke up the next morning with a email to call to manager of buger king so I did & so wanted to set up a interview for this Tuesday & it’s Sunday so I’m really unprepared & I’ve never been to a interview & I’m not sure what to expect so I was wondering if any of y’all could give me some useful tips that would help me out on Tuesday. (Please only give me advice if you have real experience & actually know what your talking about.)

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