You do not need a job to sponsor your husband, but when you do not have one, the visa officer might have concerns.
You should include a letter in the application outlining your plans for your life together in Canada when he gets his PR visa. You should explain where you will live, what jobs he will apply for, what job you hope to get, what you will use to support yourselves, etc. You should then include any proof you have. For example, if a family member is going to let you live in their house while you two look for jobs, have the family member write a letter stating this. If your husband has savings, show proof of them. If he has any property or goods in Ghana that he will sell, you should explain this and show proof of ownership. Basically, the visa officer wants to see that you have a plan about how to support yourselves once you are all in Canada.