When a venture capital firm is interested in a company it will meet with the management team numerous times to understand fully the business model and to learn more about the management. At some point in the process, the venture capital firm will decide that the investment is worth pursuing and will present a Term Sheet to the company. The Term Sheet (which is a nonbinding letter of intent) sets forth the basic terms and premises upon which the venture capital firm would be willing to invest.
The way most businesses are initially funded is by the three Fs. That is, by "friends, family, and fools." After all, who else would provide the initial seed capital to start a new enterprise? But self-funding (or relying on friends and families) will only take you so far in building out your new business.