How do i make a good impression of this girl? And make her like me?

So theres this girl that my friends know but i dont. They like to be perverted and fantisize about girls and one of them said that they would bang her and that made me kinda mad. And by them being perverted it makes all of us look bad. And im not like them so it backfires on me. So i havent met her but ive been talking to her on Facebook and she thinks im attractive and cute but we havent seen eachother in person. We might see eachother on July 4th and im just wondering on how to make her like me. Should i flirt or be a friend and build up? Etc