If u have just arrived then your Indian License is valid for 6 months. That means from the day of your arrival in Germany. Also u have to carry your Passport with you.
After six months you are not allowed to drive anymore and you have to get the "Worlds most expensive License" that is the German driving license.
This is kind of transferring Indian license in to german.
You would have to do a written test and driving test...also First Aid course and Eye Test. All this will cost your approx. 600-800 €
You could contact any driving school and ask them.
Remember though that it only makes sense if u gonna live here longer. Also if u dont do the german license within the first 3 years then u have to do a new license...which will cost you around 1200 € onwards.
Go to 2-3 Driving schools in Munich and take a quotation.
Cheers.