The first step you need to do before you start your background check is to gather as much information as you can about your subject. If you are starting your background investigation with little or no information, then check out our article, Gathering your information for a background check or people search for some ideas on how to gain more insight into your subjects general history.
One of the most basic things you can do when conducting a background check on someone is to verify their name, address, and telephone number. You never know what you might turn up with this one simple check. We have a detailed article, Verifying a name, address, or telephone number, that can help step you through this investigative process.
If you are trying to find personal assets such as real estate, you can take a look at Finding real estate and property tax information.
There is more information to come. If you need further information you can use our forums here to ask any questions you may have until then.