Re: Unemployment benefits - amount / deductions / timing etc.
Note that if you register for unemployment benefit and your mother tongue is not German (I don't know if the French side has equivalent rules), then you will be sent to a RAV induction day conducted in English. This a half day presentation where all the questions asked above are answered and you'll learn a lot about the whole process, the benefits and the potential fines. There are also English versions of the monthly forms you have to complete.
After this you will need to attend a German test, both written and oral. Based on your performance it is possible that the RAV will recommend you take German classes until you have reached a proficiency of B2. These classes are NOT mandatory. You will be offered/recommended to take the classes, but you can politely decline. Be warned that this might have a negative effect on your relationship with your personal advisor.
Fill in all the forms, be polite, try to speak German to the best of your ability, do everything the RAV asks of you and the process - while not fun - is relatively painless. Good luck with the job hunting!