I'm soc. sci and just finished 1st year. here's a really good mac site to help you to understand how 1st year works.
http://www.socialsciences.mc master...t-year-program
basically you start as a general soc. sci. student. there are a list of courses that are required and you choose 12 units from that. *note they are all level one courses which means that the lettering system starts with a "one" in front like 1A03. choose ones you find interesting but also the ones that will help you as prerequisites when you choose your major in 2nd year. for example, i chose honours anthropology for my major, so in first year i took all of the anthropology courses (1A03, 1Z03 and 1B03).
the remaining 18 units are electives. you have to have 6 (i think) units that are from humanities or religion and they rest you can choose randomly from the electives list.
you say you're interested in 2nd and 3rd year courses... so check those out and see what 1st year courses you would need to be able to get into them and make sure to include those.