score:6
I assume that you have already figured out what Visa you need and that you meet the criteria to gain admission into Germany. As far as I know, India is NOT on the list of countries that from which entry is allowed and you need some special permission or excpetion (unless you are an EU national).
So I just tackle quarantine and domestic travel. That's complicated enough:
You better make sure that the trip is really neccessary, since it will be a challenge.
One more thing: Germany is tightening up all Covid rules. They have a color coding system and and rules and restrictions depend on the color . BOchum is currently "dark red" which is the worst, although not unusual in the country at the moment.