Need a detailed build guide for Ahri

I'm going to be getting her soon, but I wanna know what to build on her and why. I played her when she was F2P and I liked her a lot but I wasn't sure then if I should buy her. But I heard a lot of good things about her and, I want to make sure of what to build on her. Any tips? and if you wouldn't mind, give me a skill build too. Thank you for you time and have a blessed day