I agree with Pesty 100%. A good general book is the original Rich Dad/Poor Dad series. It basically gives you the correct mindset. With that said a lot of the "business" books are about management skills, used after you have already started a business.
I own a few small businesses I have amassed over the years and sold one. You really have to look at your goals. The absolute best business will be one in which you have a passion or special skillset. Training comes to mind on this board, but its basic drawbacks are that it initially ties your earnings to the number of hours in a day that your work. That is a no-no for anything other than the short term.
You may also start a business you are not passionate about and be successful because it fits a broader goal i.e. " I want to start a service business that I can sell in five years and then start another one".
All to often we look down on the service sector, HVAC, Plumbing, gutter cleaning etc. I will tell you this, the guy who used to wash my cars, and clean my gutters, I saw on Oprah. He has a mansion in Palm Beach. He started doing other services for wealthy individuals and became one himself.
If I were starting a business today I think it would be service based and be one in which good customer service could retain repeat clientele. i.e. a mobile car detailing service, a window washing service, etc. I have a friend who makes $250k to $500k a year working three or four guys doing hi-rise and mid-rise commercial window washing and general pressure washing.
How did he learn? This is one of the keys. He worked for someone else doing it and learned the business. Now, admittedly he did it in a different city. Getting a job for someone else i the business you think you want to start is a great idea.
BTW if you have not had or do not understand basic accounting, take an online course or read a book. Learn to use Quickbooks. Trust me. You will be sorry if you do not.
Sorry I could not help more, this is something I am pretty passionate about. BTW I am primarilty involved in distressed real estate now. I started six years ago after selling a business and I have really enjoyed it.
Pekkerwood