good advice from all. My fav quilting site is theinboxjaunt.com She does step by step instructions on various quilting motifs. She does have a book but alot of it is on her site as well. Practice on a white board with your elbow up. If you put your elbow down, you are teaching your hand the movements. You want to teach your ARM that muscle memory. I am also on MQResource.com....its a great resource and lots of nice machine quilters of all types.
Oh...and beware! Machine quilting can be addictive! I"m just sayin'!!