Writing a new book on social justice in the Old Testament

So I've been working on a new book examining the principles of social justice in the Old Testament. The first couple chapters are pretty much done (see the first chapter below) and I've got some good idea of what the next four or five chapters will consist of. So far, I've been writing it on the bus to and from work and at nights (with our new baby daughter in the bouncer beside me). If you have any experience self-publishing a book, please give me ideas! My goal is to create something that I'll be proud of and that will add something to our collective understanding of God's principles of justice and righteousness, and the Christian role in advocating those principles.
The Unique Role of Christians in Society