I've spent the better part of the last ten years relocating.
The list of things you learn can grow long and every country is different.
My big tip is brace yourself for the admin and settling in. Admin as in basic things like getting official ID, social insurance registration (if applicable for that country), registering with the local city office. These are tedious, confusing, and sap all the excitement out of moving. Settling in is simplified with the tip below about moving with less.
But nonetheless, every little thing becomes big; for example when you get a flat, do you need to notify the various utilities departments to turn things back on? Where do you get furniture?
As boring and frustrating as it sounds, and hardly a welcome to the city, just take it in stride and every new way of doing things as a learning rather than "how much something doesn't make sense here". It's a one-off setup (at least if you stay), and you'll have plenty of time to make friends after. You might even be making friends with colleagues pretty quickly if you ask them for help moving furniture.
Good luck with the move and adventure!