You can sponsor him outland even though he is visiting you in Canada but if he plans to stay longer than his allowed 6 months, he should after 5 months apply to extend his visit status, see
http://www.cic.gc.ca/english/visit/extend-stay.asp and write as his reason that he is being sponsored for PR by you, also include file number.
There are no specific income requirements to sponsor a spouse but if you are making absolutely no money at all, they may want to know how you plan to support yourselves. They can deny you for that reason.