Two in the pi.... Wait nvm, you're 11 mmm
I'd say be yourself but I'm guessing the objective is to get her to like you, so that's out of the picture.
Nah but seriously, be confident, not cocky. That's literally it. Don't be overbearing or forceful, but take the lead. If you've got the date she obviously likes your character, just don't **** up 🙂