Help me style my natural hair!?

So my natural hair is curly and brown. Recently as it grows longer it does this weird thing where it curls but it gets super frizzy and the top layer of my hair goes straight. It's not because of the weather because I thought that originally and it still does it no matter what. So.....getting to the point, does anyone know of any good styling products I can use or tricks / tips? Please please please help!! 10 points best answer. Thank you!!