Instead of posting this question under the Home Selling category, I will post it under the 'Using Trulia' category. Trulia people are very good at helping me when I had quesitons/problems.
Then again, maybe you have it all figured out by now with Deborah's help.
The link below will take you to the XML Data Specification Guide for Trulia. If you can write HTML, with a little bit of effort, you can probably write XML and prepare the feed. So I am told. But, I don't write either.
Best of Luck!