No good ones related directly to planning that I have found. Read Paul Hawken's book about growing a business. Don't start unless you and everyone you care about have explicitly discussed the uncertainty and are committed to it.
I suppose it depends on what kind of business you are looking at starting. Are you going into consulting? The APA bookstore has a couple of books on that topic. Are you planning to be a developer? I would recommend several ULI publications - their "handbook" series is very good. I am starting a small manufacturing business. I suppose it helps to have a background in economic development. I have found pretty much all I need online.