I suggest you contact the counseling department and schedule an in-person appointment. Have your high school send your transcripts over to the cc prior to the appointment. The appointment should be before summer.
http://www.miracosta.edu/studentservices/counseling/index.html
They have an on-line orientation that is part of the registration/advisement/testing process and following it would result in priority enrollment http://www.miracosta.edu/studentservices/counseling/priorityenrollment.html