PreMed at Maryland

Hello,
I was admitted into the honors college for a major in economics. However, in the past couple of months I have decided to do premed if I attend Maryland. Does anybody with experience know if I can switch into a premed concentrated major like Biochemistry pretty easily and before the first major starts? Also, my strengths are my math skills so does anyone have an idea of what premed major is probably best suited towards math at Maryland and/or what premed major is usually most successful?