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.
Finally, get online. This is the most essential part of the MLM marketing plan. There are just so many ways to get a product and opportunity in front of thousands of people and create interest. The key here is to use a website or lead capture page to funnel traffic to using multiple marketing channels. This website or lead capture page needs to provide enough information to get the prospect interested enough to fill out a contact form or call you.