During the first date, show genuine interest in her. You should be asking her more questions than she asks you. You should listen carefully to what she says and respond with follow-up questions. It's a common belief that men don't like to listen. Prove that belief wrong with your date and learn to always be genuinely interested in what other people are saying rather than what you plan on saying next.

During the first date, focus on positive topics. In general, you shouldn't discuss politics, religion, or controversial subjects. You should discuss things she's interested in and keep everything lighthearted. Save the complaining for your buddies.

Compliment her. On the date, be sure to compliment her, but don't go overboard. More than three comments is too excessive. On an episode of Millionaire Matchmaker, one guy was doing great until he told his date no less than 13 times how beautiful she was. That scared her away. Excessive compliments can change someone's view of you from positive to negative.

Be inclusive. If it's obvious your date and you are having a great time and she mentions an interesting activity (i.e. "One of the funnest things I did was go parasailing once") then comment on it like "that sounds like fun - we should do it sometimes". A positive reaction from her to your statement is a sure sign she's interested in a second date.