If what you don't know is how to get the textures, well, you will need one or two things.
First is an MPQ Brownser.
I already used and can recommend two:
Mago's Model Editor (there's one built-in)
Wc3 Image Extractor
The main difference is when using mago's, you get the texture in .blp, but you must open the texture to see it; and, when using wc3 image extractor it saves the texture in .tga, so if you used wc3 image extractor you will need something to convert the texture from .tga to blizzard's format (.blp). In this case i recommend Blp Lab.
https://www.hiveworkshop.com/forums/tools-560/war3-model-editor-62876/
https://www.hiveworkshop.com/forums/tools-560/warcraft-iii-image-extractor-62877/
https://www.hiveworkshop.com/forums/tools-560/blp-lab-v0-4-1-a-137599/