Hi Guys, Dan here.
Jean is so right on with this. Few things attract a woman more than strong inner confidence. It's like a "girl magnet" if you will.
It's not about flirting with super kung fu pick up lines, etc.... none of that stuff works in real life, at least not to get a girlfriend. If you don't believe in what you're selling: you.
It's that simple, and yes, it's also that hard. Inner self confidence unfortunately takes time and experience to build; frankly mine really came in my early twenties.
Definitely let here know you're interested, don't pretend to want to be "just friends" and that you don't like her "that way". Ultimately a girl (just like a guy) is a real person, and is also a pack animal like the rest of us guys, and she needs friends and human contact.
I like to always point out that Girlfriend = Girl + Friend. My own preference leans more toward... Girlfriend = Awesome, Hot, Strong Minded, Super Smart Girl + Best Friend, but that's me. LOL
It's not instantaneous and maybe not what you want to hear, but you'll often end up dating girls that you get to know first. And who knows, after you know them you may not even want to date them, but it usually pays to get to know them first.
Check out this
'http://forum.askdanandjennifer.com/topic/girls-how-do-i-get-confidence', the key ingredient here.