Experience is the key. Never hire a guru who doesn't have at least some grey hair. Don't take this statement literally, but look for experience when choosing a coach. Not experience as a coach, but experience as a person, a business person, marketer, or related to any topic for which you are seek...
Before you do any surveys, I'd strongly recommend talking to 5-7 prospective customers first - either in person or on a phone/video call. During that, I'd ask questions to learn what you're competing against - what other educational toys would they consider instead of yours? What would yours ne...