well to answer your second question it requires alot of money and time to make money like that. Plus aquiring the product to sell. If you want to make money like that then you might want to consider liquidation by the truckload. But truckloads go from $10,000 to 28,000 based on the product in the trailer.
Now importing and exporting to germany you would have to check your local laws on imports and duty fees if there are any.