I'd recommend Babylock itself. They used to put out extra manuals for almost everything sold. Pictorial and really good, but very expensive. I have the one one serger feet as my Cover stitch uses the fancy feet the larger machines use. Babylock also has free projects for just about all. Here's the serger:
http://babylock.com/projects/serging/
(Just take off the serging/part of the address to see all available)
The embroidery and quilting (together) section is fantastic.
Nancy Zieman is a Babylock dealer, but doesn't show it on website or catalog as you can only buy Babylock from a dealer. But her book is also pictorial and step by step with feet and threading. She has a few things to make, also.
I haven't seen Jenny Doan, but I think they are Babylock dealers, too.