How should I dress? Fashion advice?

Okay. I am an older teenager (I'm a guy) and my ethnicity is italian/Castilian (Spain Spanish). I am roughly 6"2 (yes, considering my heritage it's strange). I weigh about 130-135 lbs., so I'm a pretty thin guy. My waist size is 29-30 inches. My hair is about 6 inches long (I take good care of it, so it looks pretty good, definitely not gross). I'd like to dress nice, but I'm not sure how. I'm colorblind, so I have to take somebody with me to buy clothes. Given my general skin tone, which is golden brown, what colors should I wear, what would match? What should i stay away from? And what types of clothing should I wear? Any suggestions?