This PDF contains the components of a school business plan with detailed guidance on what information is needed for each section.
Although, I would be very careful about taking out loans other than maybe a small personal loan that you could easily pay back even if your school doesn't take off like you would want, I use this when recruiting for my board. This will help you tell your "WHY" and "NEED" to get people behind and understand your vision.
This is helpful for startups as well as those already in business.