Certainly finding someone who believes in what you are trying to accomplish is extremily important. From there, test the person through some agreed upon goals. Watch, listen, read between the lines. People are people, aside from the qualifications, test the human side. Is this person committed? Do you connect. There are many ways of accomplishing this without making a business commitment. Take the time. Have several meetings with them. If they truly believe in you and what you are attempting to do, they will appreciate the process.