Moving from Sonassi to local hosting – no idea where to start

Hi, we’re towards our end with M2 with our Shopify store running well. We want to keep a copy of Magento up locally, we currently are hosting on Sonassi but that ends at the end of the month.

I haven’t a clue where to start on getting our current version of Magento running internally, for internal use. I have access to the database through DBeaver and the VPN into Sonassi all set up.

Please can someone point me in the right direction? Thanks