I have written business plans for all manner of industries: a coin operated jukebox company, airlines, travel companies, new product launches, and anti_aging product companies. It is not necessary to have a passion for the product or the company to write or develop a business plan. What you must have is a passion for aggregating information, getting involved with and understanding the service or product, and understanding the financials of the product or service. By financials I am not referring to having a CPA before you undertake the task, but rather understanding the presentation of the information and analysis/ numbers to support the activity being planned. Financials are important because they are the score card in the world of commerce.
The plan must be realistic in every aspect. It includes the time line, market analysis, specifies projected expenses and revenues, and creates an accurate forecasting. One must keep his plan simple, easy and clear to be understood easily. If the language is difficult and inflate for impressing the customers, it may affect in reverse way. It may be confusing for the businessman himself. It should be very easy and naturally described without any excess verbiage. It should be in proper tone so that the reader can response and react positively to that tone. One must consult with some of the institute concerned with the business sector. These firms and organizations help you to take proper decision at the right time. Consulting institutes such as business consulting firms, business technology consulting, business plan consultants, organizational consultants etc. They help and give you the proper guideline in every aspect and decision. These types of firms summarize the plan and efforts that is effective for the company.