Welcome :). Berlin in January is tough, even for German standards.
1. Just get a tax advisor who is fine speaking English with you. Just let him do everything in the beginning. Afterwards you can do more of that yourself. Try to be classified as Freiberuflich, not Gewerbetreibender. It helps if you have an engineering degree, but he can help you with that.
2. Do at least two gigs per year (Scheinselbstständigkeit).
3. Use HAYS and others to start it of.
4. Continue to learn German. Maybe do some German interview training or something to get in. There are teams working in English, but you will have an easier time overall.
1. Just get a tax advisor who is fine speaking English with you. Just let him do everything in the beginning. Afterwards you can do more of that yourself. Try to be classified as Freiberuflich, not Gewerbetreibender. It helps if you have an engineering degree, but he can help you with that.
2. Do at least two gigs per year (Scheinselbstständigkeit).
3. Use HAYS and others to start it of.
4. Continue to learn German. Maybe do some German interview training or something to get in. There are teams working in English, but you will have an easier time overall.