I recently helped out two different people who are stage managing their first shows. These are the books I’ve read, and can recommend. If you’re just starting out, start with the less expensive ones, and work your way up as you get more experience.

• The Back Stage Guide to Stage Management, by Thomas A. Kelly. Very detailed.
• The Stage Management Handbook, by Daniel A. Ionazzi (aka the yellow book). Basic, an easy read, a very good introduction.
• Stage Manager The Professional Experience, by Larry Fazio. A solid read, aimed at professionals.
• Stage Management, by Lawrence Stern. A great book, aimed at professional stage managers. Lots of real world examples.