When I ask entrepreneurs and small business owners, it is not unusual for not having any marketing plan. I once read that Sir Richard Branson never had any marketing plan when he started the 1st Virgin business many years ago. In fact in one study of entrepreneurship (I couldn't recall the name of the study) was that as much as 50% of entrepreneurs and business owners don't have a business plan and marketing plan when they first started the business.
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.