I am the beginner. I don't know how can I create the collision for my IAnimatedMeshScence Node. Is it the same or different from create the collision for the terrain ??
Irrlicht doesn't have a collision method for animated meshes (yet) - only static meshes. You will have to use an external mesh collision library to accomplish that. If you are thinking of implementing physics at a later date, you might want to try ODE or Newton for example.
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If you don't want to look into using an external physics library, I've had some success using bounding boxes (createTriangleSelectorFromBoundingBox). It's not a perfect solution but it's worked for me so far.