Make sure your model is grouped ( 1 0bject ) ...right click or go in the edit menu... select clone... Rename or leave as is...You now have a copy that you can move around...
For the background: Rendering menu... Environment... Select use map... get tour pic... Then go to the Views menu ... Viewport Background...Select "use environement background" and click on "display background" to see it in the viewport window... That's the basic ! Also when using Brazil, you have to enable the csg server in the render options and apply a Mate/Shadow material for the shadows to disable the default plane (floor)...