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.
Most of your marketing research will fit into 5 or 6 categories: Surveys, Focus Groups, Interviews, Observations, Secondary Research, or Experiments/Field Trials. We will not go into specifics for each research category on this particular blog. Regardless of the marketing research methods that are used, you need to uncover who your customers are or will be, you need to uncover what the demand is for your products or services, you need to know every competitor in the marketplace, and you need to know the market share for each company in your industry categories.