Icecrusher

So I'm fairly new to this wow modding thing (who am I kidding, if modding was wow I'd legitimately ask where I would be mining for fish) and I managed to successfully convert a custom Obj. file to M2 *yay*. But right now I'm having an issue occur where the character Model in WMV is not wearing the custom helmet I made for it. Even though it renders in WMV perfectly, when I try to put it on an Orc, nothing shows up. Mask 1 Mask2 God knows I'm probably missing a few steps to make it work after converting to M2, but I would greatly appreciate it if someone could show me how to get this blasted thing onto a character, or at least point me in the right direction.