There is really no written rules on what you should bring, maybe some Chinese cookies (those in a nice tin cans, soft like egg rolls cookies), and wall decorators (such as little painting that don't cost an arm and a leg).
如果主人是夫妻俩:A bouquet of flowers (under $25) and a bottle of French red wine (from LCBO under $30).
如果主人是位女士:A bouquet of flowers
如果主人是位男士:a bottle of French red wine