http://www.atf.gov/firearms/nlc/ffl/faqs_genques.htm
Check out the ATF web site for the RIGHT answers. It says that you must have a "business" address, a privite home can't be your business address so you can't deal firearms from your house anymore. In the past you could but the laws have changed.
Page 44 of the"Federal Firearms Regulations Reference Guide" states: "Business premises. The property on which the manufacturing or importing of firearms or ammunition or the dealing in firearms is or will be conducted. A private dwelling, no part of which is open to the public, shall not be recognized as coming within the meaning of the term." So you see, you'd have to set aside a part of your house that would be seperate form the house to stay legal. Even that could still be a "grey" area, it would be safer to have a seperate building apart from the house to conduct business.