Need some help

I need some help to make models. Im trying to make custom trees to my maps, but im not sure how to make them so they will work in the editor. Making a tree with skinn to. I have no problems with making skinns, but atatching them to the model is kinda a other problem but that I will leave to the "Skinning&Texturing Forum".
So.... I where wondering how to make a model (im using 3DMAX an know how to use it) and make it WC3 compatible. Converting or something. I have done that before but my WC3 crashed.
Any where I can find a detailed discription how to do it?
Any help would be apreciated.

www.battle.net

go to the warcraft iii art toolset forum there, should answer a bunch of questions

Thx