Ladies, what would you want from a guy in this situation? What's the best plan of attack?

I wouldnt tell her tht u wanted to ask her to prom but didnt, it would most likely make her think u dont have enough courag for a relationship and she wouldnt want to go with u, but try flirting with her, if u get positive responses, ask her out to the movies or something u think she would like. Hope this helps, good luck, hope u get the girl.