Make the person you're interested in feel:

-Unique - they've got something that NOBODY else has
-Beautiful - tell her something physical about her that you find attractive... be specific... don't say "I like your face"... tell her something specific, like: "I love the shape of your cheeks when you smile."
-Good company - tell her how happy you feel when you're with her... and how happy you get when you're ABOUT to see her.
-Missing her - tell her how much you miss her when she isn't around.

Remember something: Don't be in excess. Don't be your self in excess. Just like Cannabis plants and nutrients, too much will kill her. If you're there like 24/7, she's going to take you for granted. Plant your self first, then pull back...

-don't be ordinary - Dude, take her to the park. What? Everybody goes to the mall? Well, don't go to the fucking mall. Go to a mark. Go to the beach. Go to a forrest (hmmm, hmmm, hmmm, hmmm ) Do something DIFFERENT from the other guy.

Hope this helps! That's all I can think of from the top of my mind...

Best of luck to you!

-turtle420