I just got Inventor and I bought the book, "Autodesk Inventor, From the Top" by Daniel T. Banach and Travis Jones. It is excellent in teaching you, from the beginning, how to use Inventor. I used Mechanical Desktop before this so it may be a little easier for me to grasp the concepts, but it is a very good manual, in my opinion. Borders bookstores sells this book and Barnes & Noble probably sells it too.