editing help

[=XSL=Sentenza[ITA]]

How do i import things from the original levels to my personal map?
My ideas (very simple) was to start by creating some collage of things , it would ba a map of planet Jabiim , taken frome the EU comics by dark horse , clone wars era.

Basically a plains (the terrains of Naboo plains) but with less grass and the color would be brown with mud and some water pools.
The sky of Kamino
Some rocks from Naboo Plains or Tatooine Dune sea.
Spawn point , the same of naboo plains , veichles troops ecc the same of naboo plains

Where do i have to start , do i need some other programs beside the editor to do that? it's very simple i think