Japan have 24 ftr to land on carriers. Do never build airbases build more carriers.
Be careful with land units on the front. Often better to sacrifice a fighter then to let China/India to do a cheap retaliation on your inf.
If you take the eastern part of Soviet an a major part och China 50 IPC is in close range. My experience tells me 50 ICP is necessary to withstand American see aggression.
If you loos Caroline Island Japan itself will be threatened. Hawaii is almost always possible to block.
If you rush for the Dutch islands US will be able to cut your fleet in half. Therefore an IC is necessary in French Indochina more carriers can be built.
Malaysia is a better place to build a large factory then Kwangtung or any other 3 ICP territory on land.
Make a early SB (turn 3-4) on India if possible.
If you go for Australia your fleet will be split in two. US will go for Japan and the two fleets will be out manuvrerade and the profitable islands will not be Japanese.
Better to have fewer transports and guard them from US, India and Anzac then to wast transports for money one turn. If wasting transports make sure you get ICP for several turns.
Taking India costs to much strength. Better to minimize there money and maybe convoy them to only a couple of ICP.
In the north make sure Soviet are pushed back at least 6 ICP. From there some of your ftr will make sure you can trade some areas to really starve the Soviet and help Germany.
So. What to do about US?
The big question for Japan. To provoke India or Ansaz to attack helps to delay the US.
Some bombers on Caroline helps at the end of J1 helps you to threat Hawaii and other sq. Sidney will be block from attacking in J2.
It is possible to place a large fleet on Hawaii (not declaring war) and threaten LA, threating to to take Hawaii in J2.
If making a bloody attack on US fleet. Make sure to buy new carriers. USA, India, Anzac are short on ftr compare to Japan, but do not sacrifice fleet. Opponents have more ICP so easier for them to build more.
Japanese key points.
Small factory in Manchuria, Soviet and Chinese northern front.
Caroline Islands (Keep US away).
Malaysia (Large factory to control profitable islands) (small if you build a small in France Indochina).
Close the China route. If China muster Artillery twice they became strong.
As many planes as possible should be placed in the territory south of Kwangtung in J1. Later some planes should be placed in the first Chinese territory in the middle. From there bombers reach both India and Soviet besides China.
Do not build to strike out US fleet. Build so you can move around just as you like. Carriers is better because Japan have so many fighters and tactical fighters. If US goes all in Pacific it takes Japan 3-4 turns go get another 4-6 carriers witch adds 24 hp to the fleet. Some extra carriers saves some transports from sinking.
IF US goes all in Europe. Make sure to use fleet and subs to convoy ICS from West US. Destroy all US bonuses that you can. Including harassing Panama. Force US to put IPC in the Pacific to easy the Europe front.
One more thing. Me and my friends do not play with victory cities (VC). We play world domination or until one side gives up. So far, Japan haven’t finished the game by taking West US or Moscow any time, in anniversary Japan was the normal one to finish Moscow. The new combined Europe/Pacific are so large so then Japan has a gigantic run (90 ICP or more) it is closer to US then to Moscow. But when that is happening German have every time finished the game by taking Moscow, or it is just a mater of time until the troops gets to Moscow.
Sorry if I am a little unfocused. I am tired and it is 4.am.