Answer by Alex Sumner:
A good all-round introduction to the subject is Enochian Vision Magick by Lon Milo Duquette, which is essentially how one would go from being a complete beginner to a practising magician in all aspects of Dee’s system. Once you have that out of the way, you are ready for Dee’s original materials. I recommend John Dee’s Five Books of Mystery, edited by Joseph H Peterson, and Meric Casaubon’s “A True and Faithful Relation…” now published as Dr. John Dee’s Spiritual Diaries: 1583-1608, edited by Stephen Skinner.
Some years ago themagickalreview.org even had high quality scans of Dee’s diaries online, but unfortunately their site seems to be down.
What are the best resources on Enochian magic?
Sol Ascendans - The Website of Alex Sumner 
Enochian Magic is the most powerful magical system existed today.There are many books written about enochian magic and many magical systems developed in the basis of enochian system.This book remove all the complexity of the enochian system and create a better way to communicate with the angels.This book is a step by step guide includes -Basic Magical training and meditation. -Protection Rituals. -Detailes of the enochian tools. -48 enochian calls and how to execute them.