Figurines and dishware marked Occupied Japan were produced in Japan during the American occupation following World War II from 1945 - 1952. Check to make sure that the mark is underneath the glaze.
In order to find the value of your items, you first need to identify what the item is. There are books that can help you with that. "Occupied Japan for Collectors" from Schiffer Publishing and "The Collector's Encyclopedia of Occupied Japan Collectibles" by Collectors Books can help you identify your items. They can not be counted on for value as they are years out of date.
Once you identify your pieces, then you can look for a current, online price guide for each individual item. Value, of course, depends on condition as well as current interest.