Thank you George,
It worked with thedummy-data, I think I try it with the correct data again.
But I still have a question: When I click on "Import data", I have to choose one single tuple (aka "a row" in excel). But I want to create several pdf each with a set of data.
So corresponding to the dummy-data I want to create 3 pdf, one with the data for Max Mustermann, one for Lady Gaga and one for Lady Luck. Is that possible with adobe or do I have to use another solution?