Readings
Freud's work is preserved in a 23 volume set called The Standard Edition of the Complete Psychological Works of Sigmund Freud. For a briefer overview, you might want to try Freud's A General Introduction to Psychoanalysis or New Introductory Lectures on Psychoanalysis. They are a part of The Standard Edition, but can also be found separately and in paperback. Or you might try a collection, such as The Basic Writings of Sigmund Freud.
Some of Freud's most interesting works are The Interpretation of Dreams, his own favorite, The Psychopathology of Everyday Life, about Freudian slips and other day-to-day oddities, Totem and Taboo, Freud's views on our beginnings, Civilization and Its Discontents, his pessimistic commentary on modern society, and The Future of an Illusion, on religion. All are a part of The Standard Edition, but all are available as separate paperbacks as well.
The father of psychoanalysis has been psychoanalyzed many times. First, there is his official biography, by his student Ernest Jones. More recent is a biography by Peter Gay. A highly critical account of Freud's work is Jeffrey Masson's The Assault on Truth. The commentary on and criticism of Freud's work is unending!