Instead of online courses, I'd recommend just checking bookstores (online, big-box, local, library, college, etc) for books with tutorials or problem sets. I have found most instructors just pick-up a book and read it to you anyways, but you have to pay them for it. Also, this will allow you to look through the book and make sure it is appropriate for your current skill level, which could be an issue with an online course being too simple or advanced (often discovered after you have paid).
However, I did have a professor in college for FEA that did very well in teaching software, but that was more because he taught the theory of what the software was doing. Not sure that applies to AutoCad.
-- MechEng2005