It also needs to be written in formal format and style. You have to remember that a business plan is something that you may have to present to your business partners, financial firms and banks. So if you can, refrain from using slang in any part of your plan.
This situation is complicated by the fact that many venture capitalists will refuse to sign an NDA before looking at a business plan, lest it put them in the untenable position of looking at two independently developed look-alike business plans, both claiming originality. In such situations one may need to develop two versions of the business plan: a stripped down plan that can be used to develop a relationship and a detail plan that is only shown when investors have sufficient interest and trust to sign an NDA.
A brief account of how the company began- You should mention in your business plan the history behind the formation of you company and the background of the founders and directors.
Operations plan- This section will include details of execution of the day to day operations of your business, location of your business and how it will benefit your business, HR policies of the company and the production plan if you are offering products.