The Client-Centered Law Firm is the number one book I would recommend to lawyers opening a new firm or doubling-down on their practice. It is a practical, streamlined primer that will orient you to be successful and happy in today's legal marketplace. As Jack shows, success for clients and your own happiness are two sides of the same coin. You would be crazy to open a law firm without reading this.
I've run a law practice for a decade, and this is exactly the sort of concise, authoritative guidance I find helpful.