You need to know everything obtainable about your customers. This list will get you started. You will need their age, sex, marital status, income levels, education levels, geographic locations, where they shop, if they go to church, if they have kids, ages of children, political affiliation, what they like about your company, what they don't like, why they shop with you, what they value about your products/services, what they like the most/least about products/services, and whether prospects are unaware of your brand or products/services. Customers want you to know certain things about them and if you do, they will remain loyal to you as you take time to know them.
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.