You must reserve a week first. Otherwise, what would you post for rent in an ad when you have nothing reserved???
Unfortunately, reserving a week is "more easily said than done" with a Westgate ownership if that ownership was acquired in the resale market (as opposed to having been purchased directly from Westgate). Sleazy Westgate makes it quite difficult for resale buyer owners to reserve weeks, in an apparent (and spiteful) effort to knowingly and willfully devalue Westgate ownerships which were not purchased directly from them. Good luck --- you will surely need some.
KC