You mean that you would like to BE a foster parent?
I would do an internet search for "How to become a foster parent" + your province
Keep in mind that it is not for the faint of heart. If you become a foster parent, you will see a lot of absolutely heartbreaking situations, that you may or may not be able to do anything about. But if you would like to provide a caring and safe environment(sometime s for a long time, sometimes only for a short period) for some children who are in what is likely the darkest part of thier life so far; then I wish you all the best. It takes a very kind and generous person to do so, for sure!!
Good luck