About a week ago I randomly met a girl at a bar in NYC. I told her I was from Milan and she said she works for a fashion company from Milan, so we started talking and we ended up staying at the bar with our respective friends altogether. I'm kind of sick and tired to fuck girls on one-night-stands, so I would like to get a girlfriend, and this one would be perfect for me, given her lifestyle. The thing is that she's 29, has a good job position, and works in the fashion business; and I'm 20, I don't work, and I'm just a student.
All I have from her is her business card...
How should I proceed?