A good plan is: how do you plan to support your spouse? CIC wants to see that you won't go on welfare... and your spouse either.
So - if you are getting free housing from your family, get a letter from them.
If you are already working, then get that information already. If you will be done school and know which profession you will have, and what type of job, then include that as well. If you have savings, include the information. If your spouse has some transferable skills that will make it easy to find a job, include that as well.
My partner was a full time student, outside of Canada, when he sponsored me. he was approved even if he has been working only 5 months (summer jobs) over the last 3 years. He explained what he will do when we moved to Canada, what type of job he would get etc. and he got approved. So it's possible!
Good luck,
Sweden