Before you submit an offer on any property you should hire an agent to do comps on the area and schedule an appointment for you to view the property. If you are working with an agent, you agent can prepare your offer and will need to submit it with an preapproval letter. If you are not working with an agent, please consider doing so, you do no pay a fee unless otherwise agreed to.
You can contact the listing agent who will be able to help you learn more about that specific property (and probably will know a lot about similar properties in the area). To find an agent, just click on the yellow button on the property's Trulia listing and you will be able to start a dialogue.
Please let me know if you have any questions or if I can help with anything else. I am happy to be a resource for you. Good luck with the search!
Ali, Trulia Voices Community Manager