When your company has no revenue, the "obvious" answer is to sell as hard as you can until your cashflow positive. But it's not going to help unless the product actually works.

This seems to be the gist of the comments here, but I'd like to propose a third requirement: operations.

Ultimately, a business has to become self-sustaining, and that can't happen until the acts of building the product and selling the product become sufficiently well defined that they can be handed over to a professional staff. (See also: E-Myth)