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The way this works is that the sponsorship application and the permanent resident application go in together. Once you are approved as a sponsor your spouse's application will be processed.She will need to undergo medical, background and criminal checks.It will take about 17 months for the application to be processed.
Here is the link to the webpage that has all the information and forms:http://www.cic.gc.ca/english/immigrate/sponsor/spouse.asp
The fees are provided there.
It is likely better to retain a lawyer but it is not required.