Where should I start if I want to learn divination Zhouyi?

Li Hongcheng's books are better for beginners. You don't have to watch the yi school. It's no use for the time being.

Divination is easy to learn in the school of numbers, and Li's books are relatively easy to get started. When you have a certain foundation, you should read more books from various schools and sum up your own theoretical system of divination experience through practice.

After you learn divination, if you want to go to high school again, you must learn eight characters, then Kong Xuan, then Qimen and Liu Ren.