Hi,
As per my knowledge there is no specified amount you have to show to sponsor your spouse. If you have an income in Canada from job, whether it is full time or part time, that would be better. At the time of sponsoring you should have a job income and should not receive any welfare allowance from the government.
Governmental processing fees may vary between CAD$ 1,040 and CAD$ 1,290 depending on the province in Canada in which you are going to settle.
The sponsorship approval and PR processing could take minimum 6 months and may go beyond that period depending on the case.
After settling in Canada as a PR you can submit the sponsorship application to CPC Mississauga.
The details are in the CIC website:
http://www.cic.gc.ca/english/immigrate/sponsor/spouse.asp