In college, what major will i have to take to become a DNA Specialist?
Genetics and Microbiology.  Do you mean to become a forensic scientist?  You have to study biotechnology techniques such as PCR.  Best thing is to talk to your advisor to find a courseload/major that suits your needs.
Go to U.S. Department of Labor online.  Go to the OOH (Occupational Outlook Handbook) and enter he job you want to know about.  It will tell you the payscale, credentials needed, and how the industry is predicted to grow over the next 8 years.