Generally, in a marketing plan the following points are considered _ Market Analysis: First analysis your broader market, where are the opportunities that you can look for? What are the scopes in the current market? After analyzing the broader scope of the market; target on the niche values.
What was the outcome? As much as 90% businesses started by entrepreneurs and small business went busted or failed within a year. I experienced one of the many busts few years ago (with my cafe business) because i don't really have a proper and "the few solid sheets" called a marketing plan.