How Do I Teach The Next Generation Everything I Know About The Business?

It’s rare that a small business owner wakes up one morning and decides it’s time to transition their business to the next generation.  It’s something they usually think about for a while, likely many years before they are finally ready.  But once they decide they often want it to happen yesterday.  But before the current owner leaves they want to make sure the next generation knows everything they need to know about the business.  So how do you figure out where to start?