Next determine who your market really is. You may end up having two market demographics: one for the product and one for the opportunity. Develop a market plan for each demographic. Not everyone is an entrepreneur but they may still be interested in the product. This is why quality is key. The product has to be able to stand on its own without the opportunity. Not everyone is going to be interested in the product. Try to narrow down the demographics of those that would be interested so that you can communicate more receptively with your market.
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.