The Curmudgeon's Guide to Practicing Law, 2d ed.
by
Mark Edward Herrmann
The Marble and the Sculptor: From Law School to Law Practice
by
Keith Robert Lee
Reading bar journals and lawyers' blogs can help you get to know different types of practice.
Washington
National
Whatever area of law you're interested in, look for the ABA section or independent association that deals with it, and then follow that group's magazine, blog, or Twitter feed.