WOO somebody else doing the exact same combo as me.
You need to complete your core/compulsory courses within your first year. Four of the economics courses have no prerequisites, so you'll need to be choosing your 3 economics courses for your first semester from these, in addition to another level 1 Arts course from a Major area you think you'd like to pursue later on (you have to do three level 1 courses before you can take level 2 courses, so they pretty much force you to test the waters of different areas of Arts before you select your Major, which will happen in your 2nd year).
For my first year I've chosen ACCT1501 (Accounting & Financial Mgt 1A), ARTS1361 (Philosophy, Knowledge, Reality), ECON1101 (Microeconomics 1) and ECON1203 (Business & Economic Statistics). My timetable works out as so:
Make sure you're looking at the 2011 student handbook as well. I became confused several times by looking at the handbook from earlier years.