All of those characters will have lengthy waits. Of those listed, only Nick & Judy came out early last year, so you'll want to start there. Plan to be in line by 5 if they continue to start meeting at 6:15. Then pick the next most important and line up by 6:30. The princess/prince line will likely just have formed around 6:15, so that would be my pick. You should be able to meet them by 7:30. At that time, both Sandy Claws and Scrooge will have long waits, so I'd plan to do one during a parade and the other at the end of the night. This won't leave you much time for much else, though, but it's doable.
ETA: If Sandy Claws is your priority and you plan to line up for him first, we met Nick and Judy right after the fireworks last year with only about a 30-40 minute wait.