It was a collaborative work by John Dee and Edward Kelley. There is actually a huge amount of material out there on it. Predominantly when you see people drawing very intricate designs with sigils, glyphs, etc that is largely based upon geometric shapes it is Enochian in nature. There are of course other systems with intricate drawing Mandalas, Indian Medicine Wheel, etc Yet they typically do not also have lettering and language mixed into the drawing.
Enochian Magick was supposedly dictated to Edward Kelley via angels.
If you google the term you'll find a flood of information. If you prefer a book there are tons of them on Amazon just type in the word Enochian.
I studied it (did not practice) along with my journey where I studied just about any religious or magickal text I could get my hands on. My simple book that I've read several times is this one, and I doubt it is the best text for starting, it is simply the one I own.