The costs of water consumption, electricity and gas for heating are included in the service costs, so you pay these utilities already at your rent.
In order to be able to cook, you will have to look for a gas supplier yourself.
Tip: ask your roommates! Probably a contract already runs through one of your housemates.
The settlement of the service costs usually takes place before the 1th of July in the relevant year.
If you want to know more about the service costst, please press the link below.