"Rework" and "Getting Real" from 37 signals. If you choose one of the two — Rework.
"Indispensable. Is it possible to do without you?", "Purple cow", Seth Godin.
It's all business, the creation of the product.
The main thing — to start to do something and to try it myself. Start now. Don't try to do everything at once, but small steps. Just start with the things that like. To was visible progress.
To conduct IP — I suggest googling specific questions. The book, I think, not find, everything is changing too fast. I found answers to many questions. Well, a good accountant should find himself engaged in product, and accounting to him.
PS Branson read. Gives emotional nourishment and only momentarily. PR his Virgin brand