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.
Marketing is the soul of your business, it means anything you do for the promotion of your business comes under marketing. However, without a plan or strategy your marketing campaign will not deliver the desired results. Therefore, creating marketing plan for any business is vital.