Then start the Erasmus excursion and trips

Before starting class in every university they have the International Office, that organizes all the excursions through the city and outside trips. Some of them you have to pay and other you don't. It's a bit like school excursion in group but is a lot cheaper than booking it by your own or with friends. Is in these trips where you start to meet people and you get to know each other. So don't loose the chance. I recomend you to take the bike excursions as well. Now in spring or early autumn Germany is absolutely beautiful. Enjoy!