My main source is the wonderful book A Forest of Kings, the untold story of the ancient Maya by Linda Schele and David Freidel.
If you cannot find the book, there are a couple documentaries on youtube and some online sources, but as far as I can tell they do not nearly go into as much detail as this book does on all sorts of things about the Mayan civilization.
This book has about 500 or so pages, and its really a wonderful and imaginitive read that was suprisingly not boring and very engaging!

I hope this helps!