Chris, Trulia doesn't have all the inventory listed and it is not always up to date (Sorry Trulia, as an agent, that has been my experience with my own listings). I recommend you interview and select a Realtor who will be your buyer agent. They should not only use the internet, but other sources depending on your criteria. Some new home communities do not list on the MLS, buyer's agents should also be willing to go outside the box to find your home, searching on FSBO, Craigslist and more on your behalf. Of course for them to do that they are going to ask for you loyalty.
A buyers agent should sit and meet with you, go over what to expect, explain the contract, terminology, time lines, financing options, first time buyer programs, and more.
If you don't know how to find an agent, I can interview and refer you to a couple to interview. Or if you have friends, family, who have used an agent they too can recommend an agent for you.
Good luck, with interest rates low and prices down, it is a good time to research if buying is right for you.