The UCB business major admission information for transfer students is at http://www.haas.berkeley.edu/Undergrad/transfer_admissions.html .
The prerequisites for the business major are widely available at California community colleges. Check http://www.assist.org to check whether a given community college has all of them. Also, check the community colleges themselves about how often each course is offered and whether it is difficult to enroll (due to overcrowding).
The curriculum, as described at http://haas.berkeley.edu/Undergrad/ugbacourses.html#core , includes a marketing course as part of the core for the major; additional marketing courses are available as in-major electives.