I have read some of Dr. Yang's work, and in the Root of Chinese Qigong he outlines many different ways of breathing, and how that affects your Qi and nervous system. The most advanced level is embryonic breathing, which is fascinating to read about.
This book isn't as cheap as some of the others, but is very comprehensive and includes both theory and exercises, which makes it easier to practice without the supervision of a teacher.
https://www.amazon.ca/Root-Chinese-Qigong-Longevity-Enlightenment/dp/1886969507
Stanwood Chang from the Boston area? I use to have class with him at the Tree of Life. It really was a great class, I didn't understand how good it was until I had to move. The QiGong class Peter has on Wednesday are pretty amazing. It took me a good 3-4 years to really understand how the practice affected me. I can't imagine living without those practices. I'm currently re-reading https://smile.amazon.com/gp/product/1590309421/ and it contains lots of information I'm finding useful. I read this book before I started practicing, and it didn't make much sense. 8+ years after, I can say the book makes much more sense now. Good luck!
Damo Mitchell is the way to go.
https://www.amazon.com/gp/product/B07GNLWWTJ/ref=dbs_a_def_rwt_hsch_vapi_tkin_p1_i0
The book is very detailed but you'd want his online academy for actual instruction which is legit.
I took a workshop with Michael Winn on the Microcosmic Orbit and he has it so misconstrued and lacks a practical understanding of the practice (he uses exercises imagination and intention).
You may want to have a look at “The Way ofEnergy”. It contains both symmetric and asymmetric static postures and a variant of the Eight Pieces of Brocade, along with some background knowledge.
The Way of Energy: Mastering the Chinese Art of Internal Strength with Chi Kung Exercise (A Gaia Original) https://www.amazon.com/dp/0671736450/ref=cm_sw_r_awdo_navT_a_T34DNYCNH72MTJ4AJKJP
The author also produced a series of YouTube videos to follow along: https://youtube.com/playlist?list=PL5AC656794EE191C1
You know of Kenneth Cohen? He's been my "teacher" in Qigong. He's great. His book Way Of Qigong: The Art and Science of Chinese Energy Healing has been my Qigong bible so-to-speak
http://www.amazon.com/The-Way-Qigong-Science-Chinese/dp/0345421094
He also has some good stuff on YouTube: http://m.youtube.com/watch?v=7qZanIByNhE
Other than that--yes, practice daily and find what is best for you and your routine. Change it up every now and then from there. Other good reads that go excellent with Qigong are the Tao Te Ching and the I-Ching