Last minute vacations are available both in weeks and points account. It comes in two flavors:
1. Straight cash reservation no points required
2. Use your TPUs(or points) but at a reduced rate.
At this point, here is what I would recommend and some of these have already been mentioned.
1. Are you going to use your unit sometimes? Or most of the time? If yes to either, it may not be worth it to convert to points.
2. What is the MF? Is it a good points generator? There are good points generators that can be had for free. E.g Grandview 1 bedroom with 61k RCI points has a maintenance fee less than $500.
3. Stay in the resort or use it as a weeks account for now. Then decide later if it is not working for you.
The RCI staff can also tell you how TPUs your unit will get. Note this varies based on how many months is left to check in date.
If you did decide to leave it in weeks, setting it up is easy. You just need to sign up for an RCI account and then request your week to be deposited. You can do it online or over the phone.
A little tidbit: if you have a points account first, and then sign up for a weeks account with RCI, you don't have to pay for the weeks account. I am not sure if it works in reverse too. I have only tried the sequence I stated.