Riddle me this Batman...

[Student_Of_Games]

I'm pretty new to NL (I'm decent at Limit, but I've only recently started dabbling with NL) and there are some plays that I'm still REALLY unsure of... like how are you supposed to play small/medium pairs??? People keep telling me I'm playing them too passively but it's the one hand that I have the most trouble figuring out where I'm at with...