How do you persue a girl romanticly while at school? I have never been on a date and this girls might be attracted to me and I am attracted to her?

I barely know her but we flirt and my bestfriend and her bestfriend are together we all hangout and go to lunch togther.
How do you persue a girl romanticly while at school? I have never been on a date and this girls might be attracted to me and I am attracted to her?
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