For inspiration, I would recommend the biographies of Richard Branson & Steve Jobs. Some of the best lessons to come from these books revolve around the importance of hard work, perseverance, and how to pick yourself back up when things don't go your way.

There are so many other books I could point you to, but to start with try http://37signals.com/rework - I have seen first-hand through my consulting experience some of these recommendations help early-stage startups.