Smile. You should never show a woman that you are in a bad mood or that you are having a bad day. Keep in mind that a woman wants to meet an interesting guy, who is confident. She doesn't want to listen about your problems. At least not yet.
Dress nicely. This actually needs a lot of explaining so click on this What to Wear
Shave. You are not a starting quarterback in the Super Bowl. Besides those guys already have a woman sometimes more than one.
Get at least one nice watch to wear when you go out. Women look at watches. It is an indicator of how you've been doing financially. So don't get a cheap watch.
Use cologne and deodorant. Also shower before you go out and cut your nails at least once a week. And don't forget to brush your teeth or rinse them with mouthwash. You may think its funny but there are some people that just don't know this stuff.
Get a nice pair of shoes to wear. Women look at shoes. It is an indicator that tells women if you have a sense of style.
Take care of your hair. Choose one hairstyle, get a haircut if needed. Remember you want to attract women not scare them with your hairdo.
Exercise. Join a gym, the idea is not to get jacked like Arnold, but to get a bit stronger because women look for man that can protect them. Workouts
Get a tan (white guys) and put some lotion on (black guys) that is only if you need it (all guys). And trust me you just might. Girls don't like ashy guys. In a summer just take your lazy ass to the beach. In the winter you just may have to go tanning, just don't get crazy about it.
Relax. If you followed all that you are ready. Oh one more thing be yourself because you want the girl to like you for who you are not for who you are trying to be.