Determine what you have to offer in a partnership and what you would expect to receive in return. Develop your pitch. Keep it short, simple, and to the point. Describe what kids will do, what teachers will do, and what you will do for your partner. Contact potential partners and talk.
Most people say get to someone high up in the company.
I've often created partnerships by developing working relationships with people out in the field first. Develop and sign a simple agreement or a letter of understanding with your partner. Remember, partnerships are people relationships. People in business and industry move around more than people in education. Keep your partner informed of your progress and provide recognition, press releases, pictures, and thanks.