Import 3d models

I Have found 3D models site:

I want to add these models to the scene. is it straightforward? ( I expect 3d model to be a node )
On the internet i find unclear informations, it says that it need some kind of importers/fxml files etc…

If it is not straightforward, i would like to get source code as example.
( I also tried with javaFX and interactiveMesh, nothing happens. )

Final question:
Do jMonkey will let me rotate/scale/TranslateTransition/Collision detection with these 3D models?

The answer to all of your questions is yes.
Read through the tutorials as mitm has indicated.