One of my favorites is actually a textbook at the NYIF, which is the New York Institute of Finance. The title is 'How the Futures Markets Work' - (c) 2000. When I took my series 7 and series 3 many moons ago I took courses at this place in Times Square. Many Wall Street firms send their people there.
Jake Bernstein, the author does a great job of explaining how and why futures came about. Who trades them, why, the tools, strategies, hedging, charting and more. It's not only a great introduction but a great overview. He touches briefly on most aspects of tecnical analysis. I think you'll find it a great read. One you'll go back to as a reference.