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 or define important information about your company. In your business plan, you should have developed a Mission Statement, a Vision Statement, and a Culture Statement. If you did not develop these three items, you must create them immediately before continuing onward. It is vitally important that everyone knows about and buys in to these three company statements with all employee staff so that every person inside the business will communicate these items correctly to all external people outside of the business. You want their belief and confidence as high as the owners or top executives.