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.
Planning and Monitoring the Budget: A marketing budget planned to the smallest of details is very essential in a marketing plan. You have to be realistic and exact, and base the budget on your goals. You will also have to monitor the budget, track the expenses and analyze the spending on a budgeted and actual' basis.