There are a couple of books out there about Ed Whitney. He was a great teacher....so if there are any videos...let me know!!
I know some of his students.... (I don't actually KNOW them...but know they were his students).... Tony Couch, Judi Wagner, Skip Lawrence, Cheng-Khee Chee, Barbara Nechi and more!! The books that I know of are a reprint of Ed Whitney's book "Complete Guide to Watercolor Painting"--I got this one at the Northlight Book Club....and "Learn Watercolor the Edgar Whitney Way" by Ron Ranson...but featuring all Ed's diciples' work.
I took a class with Tony Couch and I recommend his videos....he is also a great teacher.
Good luck..and let us know your progress!!