To conduct a proper survey for market research purposes, the questions must be carefully crafted so as not to sway the view of the survey taker. And for the survey to be effective, those questions must be relevant. Don’t lead the person to answer a particular way.
Determine your target market. Not everyone will be your target customer. Find a niche. Really. Don’t think that everyone is a customer because they’re not. Did you know that at any given moment, only 3% of the people who see your business promotion/email/ad are ready to buy? The other 97% are storing the information for future use – and will forget it quickly because there is a LOT of competition out there for their attention.