If you want to make a model completely from scratch and use it in WarCraft III, you'll have to download
Gmax (Free Program), change your Computer's year to I think 2003 or 2004, and use this code to activate it: C809963E5A3297311E8652882EB3F5F3E3A6D9434DAF13DEC012EA97
Then you'll need to download and install this plugin for GMax:
http://www.hiveworkshop.com/forums/...dex-2-61-wc3-modeling-kit-3dsmax-gmax-115767/
(Just in case I didn't copy the code right, here's where I got it from:
Gmax User Identification Code)