The following are sources of information/teaching on fasting that might be beneficial for you as you consider incorporating this spiritual discipline into your devotional life:
Fasting for dummies!
Simple explanations on fasting
Seven Steps to Fasting
Written by Bill Bright, founder of Campus Crusade for Christ
The Way of Life Encyclopedia of the Bible & Christianity, by David W. Cloud
Books on Spiritual Disciplines (including fasting)
This list is from Lifeway Christian Resources but books can be purchased at Amazon, CBD, etc.
Richard Foster’s “Celebration of Discipline”
This book details several spiritual disciplines, including a chapter on fasting.