Adding to the reading list, I'd very strongly recommend the following:
A Random Walk Down Wall Street by Burton G. Malkiel lays out the basics of portfolio diversification. http://www.powells.com/biblio/1-9780393340747-0
The Great Crash: 1929 by John K. Galbraith tells the story and aftermath of the biggest stock market catastrophe of the past century. It is a slim, highly readable, and incredibly informative book. Parts of it read as if it could have been written yesterday. Much of it provides a background and context on the Crash that corrected a great many misunderstandings and holes in my own knowledge. Galbraith has a dry humor and is a strong (and often disliked by insiders) critic of much of the establishment. Fans of this book are recommended to view his video series The Age of Uncertainty.
http://www.powells.com/biblio/1-9780395859995-9
http://www.powells.com/biblio/1-9780395259474-2
http://fixyt.com/watch?v=KGSID_Uyw7w
And adding to Matt's advice: have savings. The flexibility offered by "fuck you money" as Humphrey Bogart and others have noted is tremendously valuable.