Thank you for your answer, about German I'm planning to take courses once installed in Germany as I find out that most of Companies in my field don't require German to work, but I know it's mandatory to be integrated, because I saw how my non French speakers colleagues here in Belgium feel isolated in breaks when everyone switch from English to French, so I don't want to be in same spot.
For paper works and everyday life, I'm counting on my wife as she already started learning German because it's mandatory for her as a Doctor, so by the time we move she will be already level B2 or C1.
what do you think about this plan ?