In my opinion, you are better starting by looking at the Toronto Stock Exchange. You'll find there bigger companies, the news will be easier to find and so on. See here:
http://www.tsx.com/And I don't think that a company would be listed on both the Toronto and Vancouver stock exchanges. But, some companies are listed on foreign stock exchanges like in the US.
We maintain a list of those:
http://www.superstockpicker.com/canadian_US_stock_symbols.htmlOf course, if you look at options on those stocks, they are listed on the Montreal stock exchange:
http://www.m-x.ca/