You have to show that you have strong ties to your home country (e.g. job, property ownership) and that you have no plans on remaining in Canada long term. You must also show that you have enough funds to pay for your trip to Canada. Instructions on how to apply for a TRV can be found here:Thanks.
What does it entail to get tourist visa
http://www.cic.gc.ca/english/information/applications/visa.asp