Every machine has different requirements. Some need to have the stitch length at zero others need regular stitch lengths. For me, it was most important to understand what my machine needed. Once that was settled, I could focus on the actual process.
Class I took used "Machine Quilting Made Easy" by Maureen Noble. Great techniques and exercises in that book.
We worked on little sandwiches about 14" square. That was a bit easier to handle than a full quilt. Plus, when you work on a sample square it's OK to mess up. Not so easy to adopt that attitude when you are working on a quilt.
Have fun.