Here are a couple of links to videos which will go through the basic steps for machine quilting with a walking foot, and free motion machine quilting. There is a lot of information out there and you can also take online classes at Craftsy.com. Like Zinda said, practice, practice, practice!
http://www.youtube.com/watch?v=QiJllrOdrZ4
http://www.youtube.com/watch?v=6nz0QwNv1AA