Follow the above courses, but I'd add in Inorganic Chemistry, and maybe Physical Chemistry if offered. Also try to take some courses related to the instruments you'll be using (I don't mean beakers or pipettes, I mean the big machines, like IR Spec 20, NMR, GCMS, etc). Most Chem. labs will provide a small overview of the machines, but specialized courses will really help you out. Those courses would all give you a strong background in chemistry.