There is a form you were supposed to submit to customs after you finished with immigration to declare the goods you were bringing or plan to bring into the country. Here is a link...http://www.cbsa-asfc.gc.ca/E/pbg/cf/b4a/b4a-05b.pdf
But if you have nothing to declare except what you carried on the plane, I don't think you need to worry about it.
Hey, Welcome to Canada!!