Go to Jedi training first thing for sign-ups - they start signing people up before the parks open. Both times we went last week we got there around 7:40/7:45 and were through by 7:59 (a bit stressful trying to answer the cast member's questions and keep one eye on the second hand...). On both days we were there the only time that was fully booked was the 9:40 show. Getting Jedi training should be no problem. For Millennium Falcon, it seems like the lines get shorter in the afternoon, so I'd just probably plan to ride standby, wait around 60 minutes, and have the Play Disney Parks app or something on hand to entertain the kids.