What are some ways to determine if people in your area would use your business?

I have an idea for a business that would have a couple of components. I think that one component could be done through doctor’s offices, if they were open to referring me. I know how to go about getting that information.

The problem I have is for the other part. I have no idea if anyone would want or need this service. And I don’t know how to find out. Our small local post office has a community bulletin board on which local business can place flyers and business cards. One thought I had was to put a flyer up with an internet survey address. I could put tear-offs at the bottom with the address so people could take them home. I don’t want to get into a great deal of expense, so I don’t think a mailing would be a good idea. There is also a small local paper that doesn’t charge much for ads, and I thought possibly posting the survey web address with a well-worded request might work.

What else do you suggest that I try? As well, what do you think of the two ideas I have thus far?

Thank you for any guidance you may have!