Are you playing vanilla, that is without any mods?
It's normal not be swarmed by targets, especially if your assigned patrol area isn't right in front of an enemy port or a busy convoy route. Historically convoys only really picked up a few weeks into the war, so I wouldn't worry too much if realism is your thing.
If you just want to sink targets left and right check the convoy map and move to a suitable square, or better yet, in front of a british / french port.
Even a few years into the war you may easily have to hunt for targets for a few days in a more or less realistic campaign.
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