What should I do to my hair to keep it curly?

I really want natural curls. My hair is natural, I don't have a perm, but its very soft and long. I usually wear it straight with just a blowout and flat iron. i could just wash it and let it dry but its going to become unmanageable. I have A LOT of hair, lol. Its very thick but it still has a curly texture. Can anyone recommend any products for keeping the hair curly when it dries? or techniques or anything? I've never tried using rollers and going under a dryer with products in my hair but it sounds like it would work. Does anyone have any suggestions? I'm just bored with my hair.