You will need to develop your pricing strategies for all of your products and services. Do you want to be higher or lower versus competitors? Do you plan to include labor/overhead/materials in costs? Be sure to list your pricing strategy for each product or service. A comprehensive marketing strategy will ensure your success because it will tell you how to obtain and keep customers, how to compete in your marketplace, and what resources you will use to achieve your goals and objectives.
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.