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.
To prepare for your discovery meeting you first have to contact Marketing.com using their online form, chat option, or via email or phone. They will want a brief overview of your product and services, and then they will schedule the discovery meeting. For the discovery meeting you will want to bring along: The existing marketing plan or strategy, Analysis reports, SEO strategies, Product/service descriptions, Development descriptions, Demographic information. The marketing professional will then be able to look at these and ask more specific questions to gain insight into what would be the best marketing services to include in your plan.