Blank screen on first start of OpenEMR 5.0.2

@gutiersa @brady.miller Sadly, I think it fair to say you both overestimate my understanding. I have a Docker installation. I have a backup, on a memory stick, made from a regular installation of 5.0.2 on another machine. I need that data accessible by my new Docker installation. What do I do? I am afraid I will need step by step instructions. My apologies.