I would consider speaking to a advising counselor in the department in which a forensic science major might be in. If your school does not offer one, I would recommend Google a school in San Diego or in CA that does offer it and look at their course schedule. Typically those courses are required and mandatory to receive a degree in forensic science. You can then compare and contrast which courses that school offers that your school may also offer.
On a faster note, you may want to take introductory courses in biology, human anatomy, and I would definitely recommend getting some research experience by volunteering or taking a course for research credit in a lab that is chemistry or molecular biology. I currently have a student that is a laboratory science major which he can then use that degree to get a job in almost any field that may require laboratory experience.
Once you become an upperclassman (i.e. 3-4th year) you will be able to take more specific courses that would be geared towards what you want to do. Be a field agent or work the samples in a lab. You may also want to look into being a Pathologist.
Hope this information helps and good luck.