The value of old Chinese money hinges on whether or not it is current legal tender. A bank that handles foreign currency can provide a direct exchange if the money is legal tender.
If it is not legal tender, visiting auction websites or a dealer in collectible money should aid in value assessment. Many websites, especially those dedicated to tourism, provide pictures and tips on identifying legal Chinese tender. A visit to a bank, particularly a bank with ties to a local Chinese community, might also help determine if older Chinese money is legal tender. Collectible money, especially from other countries, is harder to value. Checking auction websites, such as eBay, for similar items that have sold may reveal approximate values.