I want to import a 3d blender file n to AE CS6. I heard you could use Cinema 4D but that is too expensive so I am using blender. I am really new to AE so please help me.
AE does not natively import 3D geometry. You need plug-ins for it like Element 3D. Cineware is only available in AE CC.
There are lots of tutorials on how to integrate Blender with After Effects. You can export cameras and a bunch of other things, you just cannot use a Blender file directly inside AE. You can get an obj that was created in Blender to imp;sort into C4D lite but that's about it. What exactly are you trying to do?