If you want to buy VWL direct from Disney, you can contact DVC through their website. I wouldn't think that there is a list for the Poly yet since the project is a couple of years off.
If it's a matter of who do you call, I would presume it would be either Sales or Member Services (if you already own DVC). Wouldn't that be the logical first step?
If OP is a member he can call his guide and get on a wait list for WL. Or on a call list for Poly. Doesn't sound like OP is a member, so I would suggest he do some research on this website and understand more about how DVC works before calling and talking to the DVC guides. Or he may decide to go resale, in which case he needs to start looking at the resale broker websites.