Hi Robin,
I feel like I might be able to help you there.
I study Economics in Berlin and if not me, than my friends should be able to help you out.
Our training is very basic and more about European accounting, but we are sure able to learn quick.
I don't know how much there is to account for, but the least we could do is look for irregularities or irrelevancies.
If it is more, or you even need help saving a lot of taxes, you might want to consider doing a fundraiser for a professional.
I hope this helps!
Best wishes,
Davjd