Germany is not English speaking country. It's a bit difficult for me because everything in German.
So I compiled a list of thing to do in Munich based on my experience. I might be wrong.
For a start, buy a weekly ticket with 1 day extra at the arrival and departure.
Weekly Euro21.10 (four ring inside Munich)
Arrival Euro6.40 (going to Munich) - special price
Departure Euro6.40 (going to airport) - special price
Stay near U Bahn or S Bahn is good idea. U Bahn is underground train while S Bahn is sometimes on the ground. S Bahn also mostly travel between OstBanhNof and HaupBahnNof.
Place To Shop
1. Souvenir - Marienplatz near HofBrauHaus/HardRockCafe.
2. Chocolate and cheap item - Kaufland at EinKauf Zentrum. This is something like Walmart or Tesco.
3. Clothes - probably TK Maxx and nearby shops in Neuhauser Str. 21, 80331 München, Germany
4. Window shopping - Maximilianstraße where money is too much. Also around Marienplatz all the way to Funf Hof is shopping district.
What to see
1. Deutsche Museum - can buy 3 ticket at Euro 16. Else just buy one main ticket to main Museum near Isartor. The main one can take you 1 whole day
2. BMW Museum and BMW Welt
3. Shopping complex is called EinKauf Zentrum. You can plan to go Olympic EinKauf Zentrum, Pasing, Neuperlach etc.