Be confident, or at least seem confident. Good hygiene is a plus. If you have some flaws, be able to joke about them, a sense of humor is always good. Look them in the eyes. If you can, observe them (not stalk them ) for a while, to look for some clues as to what they are interested in. Don't use cheezy lines, just try to start a normal conversation.

And don't be afraid to approach the smoking-hot women. They usually intimidate most guys, so they generally only get hit on by sleazebags. If you are moderately normal, you have a chance.

Or you can get a dog. I got a puppy 3 months ago, and she is a chick magnet. I'm spoken for already, but it's always nice when they come up to you.