I found this article in Outreach Magazine that shared what Dan Kimball and Vintage Faith Church does to create sermon topics in their community. They sent an email out and had people answer the following questions:
1. What books of the Bible would you like to learn about?
2. What areas of personal and family struggle would you like to see discussed?
3. What theological questions would you like to see addressed?
4. What teaching topics would help you grow as you follow Jesus?