Fist go to your FFl and get a signed copy of his license. Make sure to find out how much the transfer fee will be. Then make an order for the gun at chosen web site. You will pay them for the gun and give them the copy of the FFL where they will ship the firearm over night. Once your FFL receives the gun you go through the process you would go through buying a firearm from the store (paperwork and phone call bit). You pay the transfer fee and the gun is yours.