Executive summary- The executive summary is the backbone of the business plan and it should include a brief background of the business concept, company's objective's or your plan, ownership structure, management team, service offering, target market(s), competitive advantages, marketing strategy and high-level financial details like expected profit, required funding etc. It helps the bank or finance executives to get an idea of your business.
Cover all bases. Before embarking on your plan it is a good idea to undertake some research in to what a professional business plan should include. You can then use this as a check list to make sure you have covered all the relevant areas. Sections of the business plan should include information on the company, the product/service market, competition in the field, management team, marketing strategy, operations and financials.
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.
The market potential for your service or product-You need to convince your customers and employees for your products and services you are offering and hence you have to find out the market which needs that product or service.