Judi is correct. Once you create a profile and add the locations you service to your profile, you'll be included in our Find a Pro directory when anyone searches in those areas: http://www.trulia.com/voices/directory/
However if you're looking to be included in the local agents modules you see around our site like at the bottom of the following page, you'll want to subscribe to either Trulia Pro or Trulia Local Ads.
You can learn more about Trulia Pro and Local Ads at the links below. I hope this answers your question, but feel free to clarify or let us know if you have any others.