[Question] Import a custom model into wow

[Orior]

So i recently got 3ds max, and have been playing around with it. Now i have seen some tutorials, made a few mistakes, but have been able to model something which looks remotly like a sword.

My question is. How can i import this model into WoW?
I would like this for private server use, with it's own stats and such. Though i might also import it into WoW, and model swap with some random weapon.

I really don't know how to do this, and would like to be pointed in direction of a guide or program or something.

I already HAVE the model, I just need help importing it ;P

All help appreciated