As others have said, you dont need managers to do what you are doing. You probably do need executives, not managers, when you get to the point where you need serious skills outside of engineering.
HR, legal, administrative: just outsource it to an administrative firm.
Raising money: get a CEO. You will need to get one in the VC image. Make his remuneration dependent on the investment raised.
Sales: figure out your strategy first. Sales forces are expensive.
Engineering: probably needed if it's outside your area of expertise, say software for hardware guys. Then you want a doer, not a manager.
HR, legal, administrative: just outsource it to an administrative firm.
Raising money: get a CEO. You will need to get one in the VC image. Make his remuneration dependent on the investment raised.
Sales: figure out your strategy first. Sales forces are expensive.
Engineering: probably needed if it's outside your area of expertise, say software for hardware guys. Then you want a doer, not a manager.