Include everything that you would cover in a five-minute interview.
Explain the fundamentals of the proposed business: What will your product be? Who will your customers be? Who are the owners? What do you think the future holds for your business and your industry?
Make it enthusiastic, professional, complete, and concise.
If applying for a loan, state clearly how much you want, precisely how you are going to use it, and how the money will make your business more profitable, thereby ensuring repayment.