Does the seller need to identify a TS resale company or is that something that we could do?
If you are referring to a
closing company (i.e., an entity to handle escrow of transaction funds, deed preparation and recording, resort notification after deed recording), it is almost always preferable for a buyer to use (and pay) a closing entity of his / her
own choice, to ensure independent verification of sale details and objective, arms' length handling of the transaction. It's money well spent to use an independent, third party "closer" and cost can be as little as about $150 if using LT Transfers.
That being said however, many sellers routinely try to steer closings to someone of
their choice, which often means that the "closing" entity is looking out for the seller and not necessarily for
your best interests as the buyer. Sometimes, an "in house" closer is even the very same people as those doing the selling, merely wearing a different cap for the closing. Not the best situation for a buyer; think "foxes handling hen house transactions" when a "in house" closer is involved.
P.S. I hope you aren't considering developer-direct purchase. You'll pay pennies on the dollar resale compared to the exorbitant and inflated developer-direct prices.