What do I need to do to become a Physician Assistant?

betyoucantfindme asked:
Currently, I am a freshman in college planning to major in a health-related field. What should I do during these 4 years to prepare myself to apply to a PA program?
Should I take all the classes recommended for pre-meds?
Do I need to take the MCAT?
How much patient contact and clinical experience should I get? [...]