Well... I will say what I say to every guy that I know, the first impression is really important, you have to act cool (calm), better than the otther guys (so she would prefer to hang with you) and don't show that you want the girl at all (to make her think that you can have all the girls on the planet)...
The conversation is important that you can talk about many things (let's avoid some akward silent), and when you talk make sure that you know what are you talking about (so she can see your confidence in yourself)... I don't know why, but after the first kiss you can talk less (like some reward to you for making progress)... Keep walking around makes easier for me to find new things to talk about, don't know if this could help you...
Finally... If you guys comes up to have to make a choice (like to choose a movie), make it like you had the power to make choices and all humanity would follow you, and make the coice that you like more (don't try to pick what you think that she wants)...
Don't know if this helped at all (worked with some friends, but every person is diferent at something), and good lucky out there.