For general understanding of TA, my favorite it The art and science of technical analysis by Adam Grimes for both simplicity and completeness

To understand the importance of trend, the indispensable book is The trend following bible by A. Abraham (some people get disappointed by the fact that it does not go very deep in presenting the actual trading strategies, but the importance of the whole trend following concept cannot be overstated).

For understanding of trading, the required mindset, market psychology, and everything that comes along with the territory, the two books are most often listed, and the definite part of trader's must read list:

Market wizards, by James D. Schwager,

and The reminiscences of a stock operator, by E. Lefevre

Also check all the online resources on Intraday flow trading you can get your hands on.

Hope you guys get successful and have fun in the process.