I don't know about long arm quilting because I've never tried it but I really like Leah Day's Free Motion Quilting Project. I do my FMQ on my little sewing machine (although not very well yet)
http://freemotionquilting.blogspot.com
I was/am also considering starting my own sewing/quilting business and I picked up this book from Amazon. It deals with apparel production but has a lot of things that need to be considered such as location, hours, pricing, that are applicable to any sewing business.
Sew To Success: How to make money in your home sewing business by Kathleen Spike
Hope that helps.