3D to 2D and importing backgrounds?

I have a 3D object that is in “.max” “.obj” “.fbx” format and I am trying to change it to a 2D for my 2D game. How can I do so? and how can I import a picture as a background for a level? Thank you so much everyone.

Hi i think you need to screen your objects and after that export to photoshop and clean your background. If you need create your background make big sprite picture and increase it. After you need

and

drag in to the scene and enjoy.)