Depending upon what type of real estate. If the land and anything permanently affixed to the land, such as functional buildings, it should be kept confidential.
"You could get an appraisal on real estate by asking a real estate agency to come to your house and appraise it for you. You will probably have to pay for this service, but it's the best way."
In most states you are required to place your license with a broker before you can start practicing real estate, so you wouldn't be able to do anything with it except say that you have one