The advice to rescind is right. But if you are not able to do that because you missed the window, then learning how to use your points is what is critical. Not learning is what causes many owners to sour on timeshares. That doesn't need to be the case.
1,500 points isn't a lot to start with, learning how to use them and getting comfortable with the MVC system is essential for you and your family to enjoy years of great vacations. Here are some things (not all by any means) that I found useful as my wife and I started this journey about 10 years ago and we had just about the same number of points:
1. Book as early as possible, 12-months out. You can check on
https://www.marriottvacationclubs.com to log into your account, and then under
Use Points --> Plan --> When Can I Book? to find the earliest you can book using your points.
2. Realize that getting a full-week at a resort during the high season won't be possible based on the points you have
3. Stretch your points by booking check-ins on Sunday and check-outs on Fridays (e.g. 5 days) - cost to stay Friday and Saturday nights often double from Sunday - Thursday; the trips are shorter, but you get to experience the resort(s) you desire
4. Look for the shoulder dates, meaning a few weeks +/- from the high seasons week, and off-season times, each resort has its own points chart and you can get a feeling of when these dates are.
5. Bank or Barrow future years to do the BIG vacation that you desire - you're still paying the Maintenance Fees (MFs) in the years you don't travel, however, you are taking those dream vacations you were sold
Final word of advice, read about MVC here, learn from the experts - and go to
Youtube to watch videos - Jeremy does a great job. If and when the time is right and you want to increase your ownership you'll be better prepared to do it at a lower cost and with the product that is right for you and your family.