Wow 5 pages already on this topic. Let me add some more.
Ah.. I don't believe in love any more.. i just need a guy who'll be like 10 years older than i am. That's it. A man with whom i'll feel safe, and whom i'll enjoy
kind of 
Let me "open my pink book of sex *cough* I mean 'love'"
- be physically strong. It also automatically makes you more confident. Doing martial arts also helps.
- Girls are like taking a military test. Tell her what she wants to hear. Don't tell her the truth about how she looks, smells, etc. unless it's really positive of course. Especially when talking about her weight or you can kiss her good bye without actually kissing her. Girls are really sensitive about their looks.
- be secure, know no shame.
- be funny, at least a little (it's not that hard really).
- have some hobbies but not too much or they feel dumb because they can't catch up in conversations or you will end up summing em all up and getting lost in your hobbies. Happened to me a few times -.-
- DON'T talk about exes, previous relationships, blabla.
- Indeed being older than the girl you want seems to be a big plus for girls.
- Being taller than the girl you want is also a big plus. Nothing much you can do about it really.
- Having money and a big car seems to work too. Well at least don't say you're unemployed or working at the supermarket. It will make you look like a loser that they will have to carry. If it's the case don't lie but make a joke or so and try to change the subject to something she likes to talk about.
- Don't try to imitate tricks from movies. They suck and don't work irl.
- Don't EVER go to a girl being 'overly horny' or you will fail really bad.
- Don't waste your time on 'first liners'. They don't work and they make you more nervous. Plus they probably heard em all already at the age of ~ 20 and above. Unless they are really ugly of course lol.
- Listen to the girl. Don't do all the talking. This way there is also less chance for you to screw up

. Also remember what she tells you and perhaps repeat a little of what she said before to confirm that you really were listening.
- Always smile. Not like a clown but always look happy/content.
- If possible be the center of attention at parties, crowds, school, whatever. Who cares if the teacher doesn't like you. The girls will like you. Even tough you make stupid remarks during a class it's better than being the invisible guy.
- Try, try and keep trying. Just hit on as many girls as you can. Preferably on girls not from your area in case you really mess up haha. This way you get better and you might get lucky. Then when you have enough experience you go to the girl you want and you make her yours. Some guy once said to me "women don't fall in love. You have to make em fall in love (with you). Still can't get her? Then she ain't worth it

. Go look for another one.
Almost everything from the above is out of my personal experience. It might or might not work for you or in your area. But it did for me. Tough most of em are just basic rules.