Partnerships take time, more time than you can ever imagine. Both sides must carefully weigh the benefits of the partnership with the time they are willing to give to make it work. Murphy's Laws will prevail. Partners will want to tour the school on a moment's notice or refer a very important person to you the day before the winter holidays. Look at the Big Picture.
Good partnerships proceed along established time lines, often with bumps and glitches along the way.
The big picture that you've agreed to up-front will help keep things focused. Alpha-Beta, or Do Your Shopping Elsewhere. Technology partnerships where you or your school commit to alpha test or beta test software is very risky business. I would never alpha or beta test new software with beginning technology using teachers. Beginners with buggy software are sure fire ways to kill a technology program before it begins.