1. You can either import the background picture directly by going to File>Import>Background Picture, or you can set it up in the material room. Pull down the selector to show "Background" and run a 2D image map to the "Color" node, as shown in the attached pic. The same principle applies to the ground plane, but you must first go to Display menu and turn on "Show Ground Plane". Then you will find it in the material room under "Props" section. 4. For a smart prop, simply load your obj or existing prop and parent it to the appropriate figure (e.g. parent a sword to Vicky's right hand.) Go to the Props library and press "+" to save the prop. It will say "This prop has a parent, do you want to save as a smart prop?" Click yes. Sorry I cant answer the other two!
"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan
Shire