There are a number of ways of going about the process of writing a good business plan. One of the most tried and time tested ways that works well is using a business plan template.
However, the best business plan template is that which meets all your business needs and requirements by offering you a high level of customization and a professional layout of all the content that you would like to include.
Industry Analysis - How does your product or service compare with what is currently on the market? What is the trend in the overall industry? What have been the total sales in this industry over the previous 3 to 5 years? What new products or technologies have had the biggest impact on this industry recently? What is the future outlook for these and what trends are emerging? Who are the competitors, where are they located, and how are they doing? What advantage do you offer over them? Who is buying this product or service now? Describe the typical customer for this product or service.
Appendix - Resumes of principals/management; letters of recommendation from current business associates/customers/suppliers; marketing research data; demographic data; leases or contracts in place or as promised; business licenses; price lists from suppliers; trade or industry articles or data; floor plans; information on subcontractors; liability insurance policies.