Welcome to the forum. Your whole plan depends on finding an employer to sponsor you. A large percentage of forensics work anywhere is for the government, and I imagine Canada is no different than the US. Government agencies can't sponsor immigrants. I assume your parents will also be looking for work. In most countries work permits would allow you to bring along a spouse and children, but would not apply to parents, except perhaps if they were elderly and dependent.

Look at this site from the Canadian High Commision in London.