You will need to submit your accepted offer to DVC for Right of First Refusal review. Once they have made their decision to accept or pass the offer, the deed will need to be recorded with the county. A closing company or attorney can assist with that (some have reported handling those details themselves with limited outside assistance required) - you'll need to make sure both parties understand who will pay those costs in advance. Once closed, the information will need to be sent on to Disney to be included in the DVC computer system in order to begin making reservations.