Before you go too far you should really research the market for new release fiction books. You're going up against major competition (Amazon, BN, WalMart, etc.). They have tremendous purchasing power. In fact for the last Harry Potter book I read that none of them made a profit on the book (and Amazon sold about 1 million copies). They can afford to basically, giveaway 1 million books, just to lure new customers.
Sorry to put a damper on your idea. You might want to focus on a different book market, where you can build a nice niche.