I'm not really sure about the law-side of things, but for Business & Commerce, the unit sets will indeed apply to you. Anyway, check out the key programs and see which one appeals to you most. For example, you can choose a key program in economics or whatever, it will have compulsory units and free electives. You can use those 8 free electives to complete a major, or two sub-majors. As for me, I chose an accounting key program and a major in finance.
Sorry, this might be too vague... but yeah, hope that helps a bit.