You should work directly with an agent who can 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 listing and you will be able to start a dialogue. Hope that helps ya! Good luck.
Freecreditreport.com or any of the major agancies are required to give you one report per year. There are also credit repair companies both for profit and non profit that can guide you on increasing your rating as well. All of these will help you prepare for home buying. Another good reference on this is COmmunity Housing Works, they are a non profit designed to help people step into home ownership.