this is COMPLETELY a matter of preference, ever girl has that one smell (or maybe a few) that would make her look twice if you walked by even if she didn't think you were attractive...the only problem is, it's different for EVERY GIRL
the only thing i would suggest, is go to a website, usually a big store at the mall (aka dillards, JC penny's etc) and look up fragrances, then most popular, that will give you a good idea of whats in and whats not. then it's all personal taste from there. NEVER wear something YOU don't like because you think girls will like you more, it never carries off well, and it's not who you are. Your smell is like your wardrobe in alot of ways, you have more then one shirt? well then you have more then one cologne, different ones for different occasions: dressy, casual, intimate, large groups...that sort of thing. but even so, with all that, everyone has that favorite shirt that they always manage to live in as much as possible, that would be your "signiture scent". so experiment, test test test. order free samples, go to malls and actually TAKE those little strips and spray your favorites on them, scent changes over time, each one has three "notes", a top note, a mid note and a base note. the top note is that harsh acidic smell when you first spray any cologne or perfume, that will burn off in about 15 mins tops, then you have the "mid note" that will be the sweeter smells and/or citrus smells...then the base note, this is what comes out about 3 hours after having worn the cologne of choice...hence, why you take those little testers home BEFORE buying. that is the body of the smell and the one most will smell, its the warmer, fuller, darker smell...
follow your nose, experiment, have fun..it's a whole new world to look into...it ads a finishing touch to any outfit and most girls LOVE a guy who wears a yummy cologne. just like everything else, choose what expresses yourself.