How do I use two skins on one map ?

Also, how do I get rid of hero Glow.

both can be achived through MDL editing, check the tutorials section

Edit:as for 1st question, extract the MDX, convert to mdl, press find and type .blp, edit the part in quotes (e.x. "Textures/herodemonhunter.blp") and change it to an alternate path, then make 2nd skin that path

Make sure to check wc3 had two of the same models sometimes. Even if they arent used in game. Also if you set the team color to nuetral the hero glow is near invisible. It takes a lot of space to add new models.

the 2nd can be achieved by going to the filtermode of the glow/team color in the mdl file, then add the value of static alpha 0
that way it will not be visible...

Thanks for the help you guys, I'll chekc it out when I get back from school...around 8 hours from now :s