Ordering wine in restaurants

I just turned 21, and it occurred to me that if I'm ever at a decent restaurant, it's probably normal to get wine with dinner. As I currently know absolutely nothing about wine, other than that Pinot Noir is apparently the end-all of all wines, how do I go about picking a good one?

I'm not quite as concerned with picking something whose taste will blow my mind as I am the social aspect...i.e. if I'm with a date, is it normal to confer with her and choose a bottle to share? Or for us each to get a glass of whatever the hell we feel like? Passing knowledge of wine in general that would keep me from looking like a retard would help as well.