Where can you find a sample of a proper business proposal to introduce new business to a school?

I've found some nice project proposal templates that can be modified to fit your particular project. Here are some sites with templates to check out:

http://readyset.tigris.org/templates/

http://www.io.com/~hcexres/textbook/props.html

This one gives you a Word doc project proposal template - http://www.projects.ed.ac.uk/.../MIS_Annual_Planning/TemplatesAndGuidelines/Project%20Proposal%20Template-v3.doc

Then there's always the Microsoft or Adobe document exchanges - visit their web sites to find them. Always lots of good templates there.

Good luck with your project!