This book is very detailed, and although it is true it contains the same exercises that are in the "Workbook" I think the larger format of the Workbook means that it is better to have both. The main book explains why you are doing the exercises and for myself I found this interesting of itself. Drawing upside down is a revelation, as you can disassociate yourself from identifying what the line is meant to represent and just draw/see the line. As a hobby, you can get started with very limited materials and relative low cost. Then from there move onto the use of colour and different mediums. But this is the foundation. I would also recommend the Andrew Loomis books, even though they are facsimilie hardbacks they are stuffed full of examples and explanations. If you want to try pastel pencils - William Maughan's The Artist's Complete Guide to Drawing the Head is good, but after you have completed Betty Edwards's book.