Taiwan Province Sun Zhensheng's Vernacular Book of Changes is plain and easy to understand.
Takashima Swallows Elephant's "High Guidance and Easy Breaking" is also very good, and the translation language is particularly good, which greatly inspires the divinatory images.
There are many schools of Yi-ology, such as Meihua Yijiu, Eight-character Fate, Liuyi, Feng Shui and so on. Interest is the best teacher. You can dabble in all kinds of schools, then see which method you like and practice it, so as to find out the direction of hard work and avoid detours. Accumulate some basic knowledge before you can improve.
If you are a master, what I know is "Easy Soul Network". You can go and have a look and feel about it.
It's for reference only and I wish you good luck in your study.