I have tried twice now to post longer recommendations with explanations, and twice it's b****red up. So I'll just list the books. If you want to know more then feel free to ask.
Get RRTCM first, then once you have worked through that, I recommend:
The Card Magic of Nick Trost - Nick Trost
Close Up Card Magic - Harry Lorayne
Any of Karl Fulves' 'Selfworking' books (there is some great stuff hidden in these, including an Oil and Water that actually fooled me whilst I was doing it!)
Rev