Beyond Greed and Fear - Herf Shefrin (gives a great look at the emotional decisions that are made in Investing / Gambling)
Trading & Exchanges ~ Market Microstructure for Practitioners - Larry Harris (will make you understand how the market really works, the players that are involved, and how they are compensated)
The Millionaire Next Door - Stanley & Danko (defines wealth, how real wealth is built, and how to live within your means)
These three combined with One Up on Wall Street and A Random Walk Down Wall Street should give you a good basic platform of knowledge.
We can get much more advanced once you have completed these and a few basic finance/econ text books.