If you are going to munich, i can give you some nice tips, since i'm living in munich.
If you want to go to shopping, the munich central city is nice to go shopping, but if you want to go to some shopping centres, you can take the underground to 2 of them
For sightseeing, you can use buses from the munich central station, or some sightseeing groups, which show you every interesting spot of munich. In my mind, the most interesting place is the old city of munich, and the churches that are around that old city, but you'll see them too if you take a sightseeing bus/sightseeing group.
I hope that i helped you with that
Regards