I apologize for not finding and answering your question much sooner.
There is no fee to submit listings to Trulia, but at this time we do not include FSBO listings within our search results. If you are working with a broker or agent, please direct him/her to the link below to submit your listing to us.
I'm afraid that I'm not aware of how many people from your area use our site to search. I'll check to see if that information is available and if so I'll post an update once I have it.