Be casual, don't act retarded.
Talk to her about things you're interested, you're bound to find something in common.
Ask her for a hangout with friends.
Ask her for a date.
Bad advice. Here's what works, guaranteed:
1) Go on the internet
2) Go to a shady porn site
3) At some point, either a Russian/Arab bride or a Nigerian prince shows up.
4) If it's a bride, buy them and marry them. If it's the prince, you'll be rich. Win/win situation