Under the East Asia Co-Prosperity Sphere, the nations that Japan occupied were only allowed to trade with Japan itself, thus Japan was able to reasonably effectively monopolise their output. For example, the vast majority of the world's supply of rubber was produced in the Dutch East Indies (Indonesia), and the Japanese theoretically controlled those resources completely. The more significant problem for the Japanese was its inability to effectively transport resources from their occupied territories to the Home Islands, since maritime shipping had been seized for military purposes. This was compounded by the fact that the Japanese industrial production was severely limited in comparison to the US'. At the onset of the Pacific War, the entirety of the Japanese naval fleet was mobilised, and these supply problems meant that the Japanese were never able to replace their naval losses after Coral Sea and Midway. Furthermore, Japan has always had a rice deficit, and so they relied upon forced imports from Indochina (Vietnam) to supply the Home Islands. This caused millions of people to starve in Indochina as the rice was forcibly requisitioned by the Japanese. Communist Ho Chi Minh lead the resistance against the Japanese and was active in guerrilla warfare, and seizing rice from the Japanese to redistribute. Similar sabotage and resistance movements operated across the East Asia Co-Prosperity Sphere, all to some degree of effectiveness, further limiting the Japanese Empire's ability to sustain itself.

So, to answer your dot points; the Japanese were able to extract a significant amount of resources, but not nearly all, they were never able to meet their military and naval needs, and there was widespread resistance, mainly in the form of guerrilla attacks by local nationalist groups.