more information is needed. are you canadian by birth or immigration? If so, then your child will be canadian and only needs a canadian citizenship certficate.
If not, are you ONLY intending to sponsor your child or will your child be part of a spousal application?
Unless more information is provided, we can't really guide you in the right direction.
My guess is your first stop is the immigration webstie. Google Canadian Immigration and Citizenship. You will be able to determine your eligibility and where to start...