What are all the steps needs to be follow to migrate the CRM 2015 online to 2015 On-Premise?

Hi Experts,

I am having requirement to migrate the CRM 2015 online to CRM 2015 on-premise.

We have requested Microsoft to provide DB for CRM 2015 online and we got the same.

 I am new to this process can someone please help to start this?

Thanks

Baji Rahaman