I (16) want to get my first job but idk what to say at the interview/idk what to expect

[Throwaway account]

I'm 16 and i want to get my first job. I want to try getting one in about 2 weeks, preferably as a waitress.

Idk how that whole interview thing works tbh. Some want to interview you in person, some say email or on the phone is okay too.

What kinda questions are they gonna ask me?

What do i answer if they ask me why i want to work there? My main reason for wanting to be a waitress is bc i want money and waitressing seems like a less boring/easy enough job for that. I've always wanted to be independent and move out as soon as possible, which obv I'll need money for. Do i just say that? Doesn't that seem like something bad to say in that situation?

Also, what do i wear? I usually have a goth/punk or whatever style, which means i don't have "nice clothes" to wear, do i just wear my usual clothes or should I buy some better ones?

I also have very bad anxiety, is it gonna be bad if it's noticable to them at the interview?

I just don't know what to expect at all. Any help would be appreciated.

Also I'm not from America if that matters.

Edit: idk where else to post this so I'm posting it here lol

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