If you work well from books, I highly recommend Harriet Hargrave's Mastering Machine Applique. I'm taking her class this summer at symposium and have read the book twice in anticipation. It gives very clear instructions on multiple ways to prepare the applique as well as machine settings and techniques if you plan to sew buy machine. The preparation sections are still relevant if you are planning to hand sew/needle turn.
Cheers, K