To be honest, I have never tried to do this.  I would imagine that you first need to figure out the exact camera angle and location.  Next you will need to model the objects you want in the scene including any human figures.  I do not think there are any shortcuts for this.  As for the shadows. I would probably suggest creating a flat plane and putting part of the image on it to simulate the ground plane then put the top of the image on a plane in the background.  I would probably have the camera looking down at about a 20 degree andle to give it some depth.  Just a suggestion.  Like I said, I haven't ever tried to do this either.