Fred Wilson venture capitalist and Co-Founder Union Square Ventures
Once the user base supports a long-term sustainable business (stage 2), the final “building the business” stage begins, i.e., building a management team including leaders for engineering, product, customer support, finance, marketing, sales, business development and HR (human resources).
“Founders should think of the business as [the ultimate product being built] because from the company can come [additional products and initiatives]. The company, if built correctly [with strong founder commitment], will be more important than any single product it can create”.
Wilson recommends that the founder /CEO have “a partner to help  build the company” like a senior, experienced HR leader or “a strong number two, a President or COO.”
“[The] people side of the business is harder and way more complicated than building a product is. [Culture], values and a commitment to creating a fantastic workplace [must] come from the top [and are everything].  [If] there is a meaningful culture that the entire team buys into, the team will stick together [and surmount challenges].
 A company is a self sustaining entity that expresses the hopes, dreams, vision, values and culture of the founder and leaders.” Fred Wilson The Management Team - While Building The Business Jan 16, 2012 ; http://www.avc.com/a_vc/2012/01/the-management-team-while-building-the-business.html