In many cases business plans are very important but so much of the time it is a plan to try to convince someone else that you know what you are doing with your business like banks, investors, partners, etc. Now it is true that a well written business plan can also be a major benefit to your success as well if done right. It can guide you and keep you on track and can be the vehicle to get you were you want to be especially with so many outside forces now days that bombard you. A plan can be extremely important to your success especially when you look at the statistics that says 51% of small businesses fail sometime during their first 5 years.
Remember that each section in your business plan will overlap. This means that you may cover information more than once as you move from section to section. This is okay. Your business plan may be considered as a whole or may be viewed as individual sections. This means that each section must include all key information. Don't neglect including important information simply because you feel it has been covered in other sections.