Ypres or Ieper (the dutch name for the city) is indeed located in the north parth of Belgium, in West-Flanders. They speak "West-Vlaams" over there. You won't get far with your knowledge of German . Even for us in East-Flanders it's sometimes hard to understand them if they speak in their dialect.
Dutch and german aren't that similar to each other like a lot of people think. There are indeed words that are pretty much the same, but often they have different meanings.
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. Even for us in East-Flanders it's sometimes hard to understand them if they speak in their dialect. 
