UCD will continue to open more classes for each orientation. Just get an idea of some possible classes to take but I would not really work on a set schedule until the night before your registration. Your advisor will make recommendations for which classes will be best to take your first quarter. I would consider taking the Physics Fall quarter and save CHE 2A for winter quarter since it is a required class and “weed” out class for Bio majors whom usually take in Fall quarter. I would take a Math class, a GE and possibly a Freshman seminar. You want between 13-15 units the first quarter. This gives you time to get acclimated to the quarter system. Winter quarter start the CHE series and you can then you can take 16-18 units.
Regarding registration times, I think all orientation participants have the same registration time posted in the SISweb but will be given their actual registration time during the 2nd day of orientation.