I don't have a computer with my longarm, so I can't help there, but I did get a basic longarming class when I bought the machine. An advanced class was available as well (for a fee), and I took it at the same time. The dealer is 2-1/2 hours away, but I knew that when I bought it, and since they scheduled one class right after the other, it worked out fine.
I don't know of any DVDs to help you with the QuiltMotion, but as far as the basics of using a longarm, I bought Kim Brunner's Machine Quilting for Beginners and I've Got A Longarm And I'm Not Afraid To Use It by Mindy Casperson. In addition, I bought Linda Taylor's Ultimate Guide to Machine Quilting. All of them were a great help, and I still watch them every so often.