I've just read about interesting software Autodesk 123D in the Popular Mechanics Magazine. The software basically uses photos to create a 3D cad model.
This may be the solution to not having much experience in 3D engineering software. Imagine the miniatures you can create by taking photos of objects, feeding it to this software, cad it and print it in 3D.
Best of all, I think it's free.
Now if 3D printers can just become cheaper!