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.
Monitoring and Control: the purpose of this section is to make sure that all 9 sections are followed and the proposed objectives are being achieved. Apart from these 10 sections a marketing plan in order to be successful it needs to have 3 characteristics. The plan must be flexible, because the business environment is changing rapidly and the plan needs to be able to adapt in order to achieve the objectives that have been set.