Okay, yet another hair question. How to cut and style my hair ?

My hair isn't straight, but it isn't curly either. It's semi wavy, and when I brush it to get tangles out it kinda poofs out. When I blowdry it, it frizzes and poofs out like no other. Currently, its length is about 3 inches below my shoulders. How should I get it cut and how do I style it?!