Li Juming is a teacher in Hongkong. He always writes books about Feng Shui mascots, but there are no books about prediction.
Self-study is difficult. If you really want to learn prediction, you'd better go to China Zhouyi Research Association. They train many students to go out accurately and make a lot of money.
If you want to teach yourself, you can also download it from the website of China Zhouyi Research Association. There are many free books.