mixed women/women of color: natural hair.

So I just recently decided that I wanted to stop using heat on my hair altogether. I am biracial, my dad is black with pretty coarse hair, and my mother is white with extremely thin pin straight hair. I do not know what my natural hair is like because I've been straightening it for the past 15 years, almost every single day. I'm needing help/advice on how to make my hair manageable, less frizzy, and more curls. As well as products/instructions on how to maintain my hair and the up keep. Because right now my hair just tends to go flat with no curl and only frizz. Please help, I'm really wanting to go the all natural route!