Hi,

I have an immigrant visa & would be landing in Canada to become a Permanent resident.

My Company also has business in Canada , I am planning to take a transfer to Canada . As I will become a PR after landing , I am not sure what documents to provide to my company for facilitating my transfer.

I only have an immigration on my passport at present

If your have a valid permanent resident visa, then you are not required to obtain any additional permission in order to work in Canada after landing.