The Institute of European Studies offers a great range of courses for exchange students in German and also English language. For your learning agreement you can choose from courses in these study program as well as from other courses offered in the Department of Social Sciences (FB 8). Courses in european studies usually offer the option to obtain 3 or 6 credit points depending on the kind of exam you have to pass at the end of the semester.
You can find a list of all courses offered in the different study programmes in the course catalogue (look for the entries below “Fachbereich 08: Sozialwissenschaften” for the social science courses).
The International Office of the University of Bremen offers a great range of information regarding the Erasmus program and your stay in Bremen in general. If you are enrolling at the Institute of Europan Studies via an exchange program, you can read the relevant information about your nomination and important deadlines here. The IO has also put together a list of practical information about studying in Bremen concerning topics like housing and finances in this section. Additionally, you can have a look at the website of the German Academic Exchange Service (DAAD), which also provides lots of information about studying in Germany.
You are welcome to participate in the orientation program for incoming students organised by the International Office in cooperation with the Erasmus Initiative Bremen which usually takes place two or three weeks before lectures start.