Your marketing efforts do not have to be expensive. In many cases, companies that don't have marketing plans spend more than is necessary to reach their customers. With a plan that will spell out the ways you will market your company, you will save money and energy on your business marketing efforts. Creating an effective marketing plan is one of the most crucial elements of planning for your business.
While I still recommend the business planning process, I caution you to realize that a beautifully crafted document does not always equal business success. I've worked with many entrepreneurs who successfully launched without a plan, and some with beautifully written plans that never materialized. You and your business idea are unique. Your planning process will be unique as well. Be wary of one_size_fits_all advice or pronouncements from experts about how you should proceed.