Man, 14? That's awesome. You'll be a pro by the time you're legally drinking.
I don't really think that any of this would be appropriate for a 14 year old, but if you think it will help, I see no harm in giving it a go. Just don't go crazy, ok?
I would say that if she is kinoing you back and IOIing you, then you need to get her out of the school environment. Tell her that you are going to a movie on the weekend or whatever and that she should come. Don't be shy about it, either, if she doesn't come then you'll just go with your mates.
The important thing here would be to get her away from school and get her invested in you and used to your presence in her own life, that would be the best way to set yourself up as a boyfriend for her.
Maybe for a first 'date' you should bring her somewhere more interactive, though. Like a roller blade place or a waterslide, something that you can both have fun with that you can also keep to about an hour long so neither of you runs out of stuff to talk about. Then when you are comfortable together, take her to the movies and by then she will be totally fine with you putting your arm around her -which you HAVE to do AS SOON AS YOU SIT DOWN. There is nothing that says alpha like grabbing your girl straight away and pulling her close. She'll love it. You might even be able to give her a little kiss on the cheek as the movie starts. She'll be thinking about it all through the movie.
Above all, don't be awkward. Think up about five or ten things that you can do when it gets awkward (which it most probably will) and practice them a little before you go out. Things like starting a story, a bit of a neg where appropriate, maybe a situational assumption.
Good luck dude, and I would love to see how hardcore PUA you are at 18!
