Book research is definitely important, but you can rely on local factors to outweigh any one-size-fits-all advice you may pick up. Things like zoning, real estate, construction, and licensing will introduce many more complications than the brewing side and be unique to every brewery.
The BP book mentioned is a good starting point, if lacking on the technical side. I'd also suggest the Brewery Operations Manual by Tom Hennessy for a quick overview of both the brewing and business sides, especially if you're coming straight in from home brewing and plan to do the brewing yourself.
And (obviously?) I disagree that the market is saturated. I certainly wouldn't get into the distribution market right now, but the US still doesn't have as many small breweries as pre-Prohibition, let alone per capita. If you have a few thousand people within walking distance, you have a market opportunity for a brewpub, and 97% of all brewpubs that have ever existed are still open.