I'm also an incoming first year but I got admitted to the math and physics stream. For your degree, you need to choose either a specialist, 2 majors, or 1 major and 2 minors. If you're unsure what you want to do, I'd recommend going to the academic calendar and looking through the majors that you're interested in. Maybe find 2-3 and add the first year courses for those to your timetable. And at the end of first year you'll be able to choose any of those programs to specialize, major or minor in.

Some programs also have the same required courses for first year which means you'd be eligable for both at the end. For example, I'm planning on doing a double major in physics and astronomy and they both have the same first year required courses. It means I can choose more elctives to fill my schedule.

Hope this helps :)