How to do a half up half down hairstyle?

I have really poofy, curly,  3b hair that is flat at the top and puffs out at the bottom, making a triangle. My hair is also cut into two layers: One really puffy one that reaches to the bottom of my neck, and one that is thinner, looser, and reaches a little below my shoulders. Whenever I try to do half up half down, the part that is up justs poofs out. I'm also not sure how much hair to use, and what part of my head that the pinned-up part should go. Does anyone have experience with this hairstyle, and can instruct me on the best way to do it with my hair?