Useful Ressources
Your first questions could already be answered in the "Welcome Document"!
Article "Starke Stimme" (German) in "unileben, edition 03-2016" reports about the beginning of the Joint Working Committee of the Doctoral Candidate Councils.
The "Guidelines for good supervision of the doctoral candidates" give an overview for your supervision.
Equal opportunities at the University Freiburg.
In case of conflicts between you and your supervisor you can find information about the "Ombudsprocess".
The importance of mental health is highlighted in the following article published by the UniversitätsverlagsWebler ("The Mental Health Crisis among Doctoral Researchers – Findings and Best Practices)".
Further useful informations can be found here.