Prepare a thick cotton-padded jacket or coat, a suit (optional), a pair of winter shoes, a scarf, and a pair of thick jeans. No sweaters or thermal underwear, no! It's cold outside, but there's a heater inside. The local custom is, don't run red lights, don't spit, don't smoke in public places, don't make loud noises, and don't commit any other bad Chinese habits you can think of. There is no gourmet food in Germany, only fine wine, but bringing wine is too wasteful. Buy some kitchenware like Zwilling, or buy some luxuries like watches. I can only help you so much...