When writing a business plan you sometimes end up locking yourself away. You might have unique ideas which lead you to seek some isolation and secrecy, or if you are going to be a sole trader you may only have one person to consult namely yourself. But it is fantastic to try and get broader input on your business plan _ whether from a professional, or simply from friends and family whom you trust. I say that because of course you need to be careful with commercially sensitive ideas, as you do not want to pass your plan on to someone in the pub who then starts your idea before you across the road.
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.