Having taught at an art school for a few years I tried to find books on rendering storyboards and ad comp layouts to recommend to my students, without success. I decided to write a book on the subject in 1982. This book is out of print but can still be found used and very reasonably priced on the internet, try Amazon.com and Google for other used book dealers.
The book covers tools and exercises, the development of a layout assignment, many step-by-step instructions, typical assignments and how to get started in this field. It's a good book for beginners as well as established artists as I show actual assignments that I was working on at the time in Paris, France as well as work from the U.S. during this period.
I am in the process of trying to find more examples of storyboards and ad comp work that I have done, I've actually run out of things to post. Most work done before I started delivering over the internet in 2000 was delivered to the ad agencies and usually there was no time to have copies made. Luckily I saved most of the work done after 2000 and have posted a great deal of it.
Here are examples of layouts from the book which were done for a Renault catalog, the top one is a rough that I did before the final comp layout shown below