I will share with you a book that is contained inside the mega library of fringe: "The Science of Breath", by Yogi Ramacharaka/William Walker Atkinson. This is one of the best books to train and establish GOOD breathing patterns. This book transformed me, and I managed to finally overcome by bad respiratory habits. I hope it does the same to you OP.
Follow the teachings and have fun doing the exercises.
Good vibes!!