If you plan on taking advantage of the offer for a free marketing plan, then you need to know what you have to get together before you have the discovery meeting with your consultant. Your consultant will then create your free marketing plan that will include recommendations for what additional marketing services can help your business.
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.