From what I've heard, using DVC points for anything other than DVC is a poor value so you are better off renting your DVC points and using the cash to book
ABD. As someone who regularly rents DVC points, I can tell you there is definitely a market for them and there are services which make it very easy to do. I've used DVC Rental Store and David's Vacation Club to rent and have had great experiences.
We are doing our first ABD this summer with our 12yo -Norway. We've been wanting to do this trip since she was 5 and then when we decided she was old enough to do an overseas trip covid happened. So excited to finally go. Which adventure is best for a first timer depends on what you enjoy in travel. We love being outdoors doing active things and especially love water and mountains so Norway, Alaska, Wyoming, New Zealand and Australia are on our list. I think if this one goes well, New Zealand will be next for us.