The question of starting a business places high demands on the founders. The journey from a business idea to a technically mature product is no longer sufficient today. Banks, funding associations, and potential clients require guarantees and evidence of a company's future viability. Therefore, a number of technical and economic considerations must precede economic success. Considerations regarding the business plan, marketing plan, as well as market and competition analysis are essential for a successful business startup. The author illustrates with concrete examples how such plans are developed and what they must contain in order to convince banks and authorities.