Munich is among the most expensive cities for living. If you want prices for a room directly check WG-Gesucht or Kleinanzeigen and you'll get a good first impression in regard to what you actually want. We can't know your requirements (living alone? Need a separate bedroom away from kitchen? Has to be on ground floor? How close to the center / university do you wanna live?)
I can give you statistics: the avg price per sqm is currently 22 euro. Which means if you find a room of eg 10sqm, in a flat that you share with two other people where community rooms (bathroom, balcony, kitchen...) are 30qm, you'll pay for 20qm, which means 440 Euro COLD. Cold means without internet, tax, energy, water etc...