I've pulled many girls, fucked the majority of them and married one of them. I guess I can lay out some good advice for you.
1. Be yourself, do not lie, do not act pretentious.
2. Confidence is a must. Do not show any signs of weakness.
3. Take the initiative. Do not be afraid. If you feel like she wants you to kiss her, fucking kiss her. She is 19 now so she isn't a little girl. She most likely is as sexual as you are, or perhaps even more.
4. If you get denied, take it like the man you are, get over it, and move on. Plenty of vaginas out there.
5. Make her feel secure, protected and important. But don't let her whip you around like her little bitch.
6. Listen to her blabber on about bullshit and put an effort into responding. Girls will bitch and moan if you "Don't care"
7. When you have sex for the first time make sure you give her the most pleasuresble oral sex ever. She will come back, guaranteed.