Businesses are different from each other, and thus each business plan is written for a completely different reason. The very first thing, thus, to keep in mind is exactly what you are writing it for. If it is going to be used for receiving funds, make sure that in the document the businesses most important message is sent across well and strongly.
If it is being used for closing in on lenders rather than equity investors the profits shown will not be as important. Understand your own objectives before you begin to tackle the business plan. Keep in mind that objectives are specific, solid, and measurable; and the strategies should explain properly just how you are planning to meet your objectives.
And keep it absolutely clear and brief, and also not more than 15-30 pages including attachments. Remember to keep it short and simple.
The final plan should be able to answer basic questions regarding these categories; the product or the service or business, the market changes, the finances involved and your management team.
Make sure that you are able to cover these categories and then add other categories which seem important for the audience or the readers of the plan.
It may seem very difficult to think about, but you have to have a fair idea of what you would do if the business doesn't work out, or for some reason you have to shut the doors. Whatever takes place, you must have an idea of just how you plan to handle disassembling of the business. The potential investors will be interested in this as they would want to find out how they will receive their money!
Whatever be the plan, you must take some time out and pay adequate attention to the plan and go over the likely outcomes.
For more details on this, please visit: How to Write a Winning Business Plan and Free Business Plan Templates