How to rig a bow and export it to NIFSkope

Hi all,

I just finished a bow for Skyrim called reapers edge. The problem is that I have no idea on how to get the bow to pull back in the game. I have narrowed it down that the bow needs to be skinned which I did and added bones to the mesh. Now the question is how do I get the bow into NIFSkope and does anyone have the settings on how to export it with the skinning intact? Thanks!