Talk to your developers, friends, etc. Tell them briefly what you are doing, and what sort of help you think you need. Keep it general - you're working on the technology side, you think you'd benefit from a trusted associate on the business side. But try to lean people's thinking away from MBAs - and away from sales or marketing communication - and more to market analysis.<p>Do you or your developer friends know people who have built businesses before? Talk to them.<p>No matter who you talk to, get used to saying something like "I really appreciate your time, who else do you think I should talk to? Do you have their number? Can I use your name?"<p>Also try to talk to the people who might use your service. Give them a brief overview of the problem you are trying to solve, let them tell you how it might or does not fit in to their world. Listen, and listen between the lines. Then do it again. If they seem interested, ask them how much such a service would save them in time, effort, or other forms of money.<p>Do NOT change your service based on one or even ten conversations, not until you understand the story between the lines. At least not right away.<p>If you need a sounding board, rather than a marketing associate, ask some of your trusted friends, technical and non-technical, if you can buy them drinks or dinner a couple of times a month and share what you've learned.<p>Practice duck testing (cf recent HN articles): You should be able to explain the idea and what you've heard from others to a rubber duck.