You and your dd sound so prepared! It's great to hear.
I knew absolutely nothing about it. I was so embarrased when I got AF for the first time and I didn't know what it was, so I hid my undies in the laundry in the hope my mum wouldn't notice them when she did the washing. Fortunately my grandma was over that day and did the washing, saw the undies and told me all about AF.