First of all, I apologize if this is something that is all around the forum, but as far as I can tell, I see no clear answer (as it might not be very easy to simplify).
Im quite new to modding so I cant really say I have much experience with it.

To the point. I want to try get model edits from current retail wow to a 3.3.5a private server. Is this possible in any way? And if so, how?

Any simplified explanation is appreciated.

Again, I apologize if its already asked and answered.