The homes that are listed on the MLS will carry over onto Trulia, when the agent signs up with Trulia. I just listed a 2/2 golf front home in Jupiter and trulia had emailed me to let me know it was Live on Trulia. After its Live- Additional pictures, text, etc, can be added. Trulia, Zillow and Realtor.com are all sites that I have used to promote properties for sale. All have been great. They all seem to have a decent amount of traffic. My suggestions is to get with a local, experienced Agent who can list your home and assist with the marketing.
Hope This helps. Todd