You can find a sample business plan for a small business in all kinds of formats. There is a sample business plan for a small business where you basically fill in the blanks or you can have access to a sample business plan for a small business where you can pattern yours from it or you can develop a business plan that is centered on what you want for your dreams and your life.
Any casual viewer of the BBC programme, Dragons Den will be aware of how easy it is for weaknesses or gaps to be identified. Depending upon the purpose of the plan, this may, or may not, prove to be critical. It is often easier to recognise such weaknesses and gaps, and be prepared to deal with them, either by noting them in the plan itself, or having appropriate answers available should the need arise.