1) call a resale agent and tell that what you would like
2) wait for a call back, hunt around for a matching resale on line (many don't even make it online before they are offered to customers)
3) complete initial paperwork and send deposit (varies due to amount of contract)
4) wait to clear ROFR
5) work with closing agent to complete final paperwork and send final cheque
6) wait for
DVC/MS to load you into the system
7) wait for member information package
It's a lot of waiting, but it's worth it! Just plan to act on your contract, in particular if it's a small one. I received a call 48 hours after contacting TSS, and decided within a few hours to snap it up. I do know that the same contract was offered to a few other customers, who were dithering for whatever reason.
'Your' contract will come along eventually, just be prepared to put down a portion of the total cost right away.
Hope that helps!