Student's supervisors

How often is a student/new counsellor required to meet with their supervisor? What credentials are required for someone to become a supervisor? What are your rights and responsibilities as a supervisee? How can you maximize the benefits you derive from the supervision process? What are your thoughts about whether supervision, in some form, should be required after licensure? Be sure to include references to the applicable codes of ethics and any statutes, rules, or regulations from the state of California.