if you want to do animations, you must have an armature in pose mod, make it the parent of the mesh you want to animate. Then press ctrl left arrow, you should now be in the animation mode, look up a tutorail on doing keyframes to get it actully moving, change the window on the right to the action wondow, or animation or something i can't remember. Rename the animation to whatever it is you want it to be called, then export it, i know it works, but whether i have explained it right i do not know, its how i do animations for things like the military jeep, TF2 weapons, so it works, just hard.