The household registration book only needs translation, not notarization. Mine was translated by my German colleague. There is no need for notarization at all. English certificate is not necessary. German learning is not entirely necessary. I am the proof of bilingual time in German class. It's better to have it, but it doesn't matter if you don't have it. What matters is the contract of the German company! And insurance. You can apply for travel insurance for 1-2 months first. But you must join the company's medical insurance system as soon as you arrive in Germany. I have got a German work visa for two years, and now I live in Germany, and I am very comfortable with it. I hope it helps you.