Identify Business Functions
This is the first step for a leader starting a business.  He or she has to identify these for his own particular kind of business.  For example, all businesses small or large have to have an executive function, an accounting function and a sales function.

Businesses that make products have a manufacturing function, inventory, shipping and receiving, and some more.

Service businesses have a customer service function and sometimes a field service function.  Service companies that deliver projects have the project management function and sometimes the estimator function.