In general:
If you come to Germany as an international student, you should have secured funding for your entire degree programme (which can take longer than the standard period of study!).
No one can guarantee that you will find a part-time job here with which you can pay your rent and living costs. And: You can only open an account in Germany from abroad via Deutsche Bank.
Experience also shows that if you have to work a lot because you have to finance your entire degree programme yourself, it is easy to neglect your university duties. However, financial support is available: