To keep things simple, you might want to survey existing clients and contacts. Using a newsletter approach, use an online survey, asking 3-5 simple questions. Happy to access my archives to help you develop the request and questions.

To increase participation, offer an incentive to thank people who take the time to respond.

Keep in mind this is the first step in what might be a long process. Keep it simple and do whatever it takes to avoid paralysis by analysis.