It is not realistic. If you don't know how to start a small business you have no chance, especially if you don't have any money. Go talk to a lawyer about starting your business, and then move on to using the search button here.
This post was not helpful. He said limited capital not no capital.
I like the suggestion about contacting your local SBA office. You could also watch the foreclosure listings and see which agent/brokerage is listing them. You could visit their office and see if you may be able to provide your services to them.
The search feature should be used first. There is a wealth of information in this topic.