Polar Bears ---> Flame Giants

[spzero]

I've recently been working on my own model edits trieing my best to get a start but one of my main problems is that with the program im currently using to get a start I'm having a few issues:

1:I cannot just change one type of bear all end up changing
2:The Flame Giant in-game will not be textured just all white
3:The Flame Giant (All giants I tried) wouldn't scale right.

So I've come to ask for a quick request of Having the Polar Bears in game to be turned into Flame Giants (See The Vault Boss for example) and have them scaled down to about the size of a player character (Like Night Elf)

If anybody could also give me pointers i'd appreciate it =D