You should be able to prove that you can support yourself and your family in Canada, so in your past experience as a self-employed person, you should have enough income to support yourself at least in a Canadian Economy.
You should also have worked at an international level as a self-employed person. Something to confirm that you are among the best that is out there, if not the best. It is up to you to prove that.
In my case, my transition from Pakistan and successfully establishing a business in the UK is a validation to confirm that I have worked at an international level.
If you can confirm these 2 requirements, then you can have build your case.