5
Be sensitive and caring. Let her cry on your shoulder if she's sad. Make her smile when she's feeling crummy. However remember that she wants a man in her life so don't be supplicating.
Whisper in her ear. Girls love this.
If you have little siblings, nieces, or nephews, show her that you really care for them. Play with them, watch over and protect them, show the girl that they look up to you.
Help others in front of her (although you should be helpful anyway). Help the poor and needy to show that how much you care for others. But, show some more care for her, which she thinks that, this is only for her.
6
Learn to dance and learn dance etiquette. Take some ballroom classes to build your confidence, so you learn to lead a girl through a song. Girls love guys that can dance.
7
Be original. For example, for Valentine's Day (if you celebrate it) be sweet or thoughtful instead of showy and cliched. A dozen red roses may be the traditional romantic gift, but most girls will be better pleased with a few of their favorite flowers tied with a red, pink, or white ribbon. Actually remembering a girl's favorites will endear you to her more than any elaborate scheme. If it's early in the relationship, though, and you don't know her favorites yet, a teddy bear (or other stuffed animal) is a perfectly fine fallback gift. Do something original to you. But make sure you make her feel comfortable as well.
Pick up lines are OK as long as they aren't obnoxious (meaning avoid the vast majority) or overtly sexual to someone you don't know.
8
Dress nicely. Use an attractive cologne if necessary. Be very hygienic when you are around her.
9
Make her laugh. Girls love guys with a great sense of humor. That doesn't mean you should never take anything seriously, or else you'll come off as a clown.
Try to know her a little bit more before you attempt to be jocular (certain jokes for you might not be funny to her). Knowing her culture, her background, and most importantly things she likes will also be helpful.