I’ve written in earlier posts about how easy it is to negotiate the subway/metro, and the train stations in Tokyo, so here are the maps to help you do so. Also posted is a map of Tokyo’s streets.
As the train stations link to everywhere in Japan, if you’re travelling on, it could be useful to study these before setting out. The subway/metro maps are a doddle to follow and the system can’t be recommended highly enough for getting around the city.
Hope these help.