I am 15 and i am in high school. There is this new girl that moved here before christmas and i have a crush on her. So me and my buddy invited a bunch of our friends to hang out at the bowling ally one night but my friend didnt tell me he was inviting my crush. We all started chating and after a while we all had a great time but i really like my crush alot now and i want to ask her out. How can i talk to her at school without making a fool of my self?

Also what should i wear, how should i ask her out, and what are some topics to talk about.