Law firms are unique business organizations whose Rules of Professional Conduct both guide and dictate many aspects of day-to-day management. Properly establishing procedures to handle such issues as client intake, end of engagement, conflict checking and so forth will ensure that work flows smoothly through the office and that the firm does not commit ethical blunders or commit more serious mistakes in its day-to-day operations.
There are so many areas of "best practices" management that defy categorization. You will find resources in this area for most of those topics that you cannot find elsewhere.