Working as an Ad designer, you have to have a strong background in local culture, for example, history, language etc in order to have creative ideas. Personally I don’t think it’s a easy career for you in Canada. But if you want to study here and work in China, it is maybe a very good choose. Being a Apply arts designer, you need good feeling with color, font and layout.
There are so many competitions in design field. Think about how hard it will be to have a creative brain for years. Choose your career carefully before you do that.