You need the right software. Go to wc3sear.ch and look in their files section. Look for an MPQ archiver, or an extractor program, to take the models out of Warcraft 3. As far as editing them, you need some kind of 3D graphic editing program.
Guys just a heads up I am going to be shutting the site down soon. I am just waiting on the NUON people to decide whether they want to transfer forum data and keep the discord. My email is [email protected] for anyone that wants to keep in touch and I have a facebook too. I will make an official post later. Love you guys and will miss everyone!