First date help what do I do?

Ok so I've known this girl for a Long time but just started talking to her this year. We really like each other an I just asked her out this past weekend. I was going to do it on a rooftop while watching a fireworks show but then she left early so I walked 3 miles from my house to by her a rose and ended up sprinting back in the rain to catch up to her. She's gone for the week and I we talk everyday. I want to ask her to the movies next week when she gets back. What movie should we see (we are 14) transformers 3 or whatever else is out. Whenever we talk we always laugh an tease eachother and we have hung out with a group of friends quite a lot (that was before we were dating) and so should we go alone or invite other people to make it just another HanG out thing. Also I don't know if I should make a move as I feel she would be a litle shy about that. I do no she really likes me an I want to make this works. I'd never been on a date nor have I kissed anyone. PLEASE HELP me I want the relationship to last