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.
External Environment _The next part of the marketing plan is the external environment. What is going on outside of your business? Business owners should take a look at what is going on in the external environment or industry. Are other businesses in your industry succeeding or closing shop? Is the industry in a growth or declining phase? Could there be threats that could jeopardize your business operations?