The survey that you do can be a starting point but be sure they know you will not be delivering the next week. It takes time to grow the produce and fish. Once you have made contacts with potential clients become a fairly consistent customer of theirs. I always preferred to do business with someone I knew than the "glad-handing" slick sales rep that he only sees when there is a profit to be made. Be sure to see your contact while your there and continue to probe for new things they may need, it might be something even you have not considered.

Welcome to the forum and best of luck with your venture.