From: Marseilles, France
As for the placement of the Mighty Imperial Japanese Navy at the start of the Global War scenario.
I like to have the Strike Fleet composed of the slow BB, slow CV, in a port able to sail into the Sea next to Russia and the China Sea. They will move in the future to Canton for the invasions around the South China Sea, but are a threat to Russia initialy.
The rest of the fleet (Combined with the 5 moving CVs and BBs, Mobile with the Mogami cruisers, and the last one with the 6 moving CVs and some cruisers) is based in Tokyo, where it can go anywhere needed later, but preferably nowhere before the show begins in late 1941, to save oil.
SUBs are preferably based in Tokyo too. Having them in Truk is fine, sometimes preferable, but you may use them initialy in the Indian Ocean, so a rebase will have to be done before they are fully threatening anyway.
1 CP is placed in the sea adjacent to Russia, to ship the 1 RP from Manchuria to Japan. This also opens a second supply route from Japan to Asia in case of emergencies. Good to be ready for that since day 1.
5 CP are placed in the sea east of Tokyo, for the US / Jap trade agreement.
3 CP are placed in the South China sea, to bring back the NEI oil, and to ship Hainan RP to Canton for use in the red factory there.
5 CP are placed in the China Sea, for the 2 NEI oil, and for the formose RP and both extra Chinese RP. 2 of them can be alternatively placed in the sea next to Russia. An extra one can be placed here at start, if a Chinese resource is near to fall into your hands. 2 for 2 resources.
1 CP are placed in each of the Marianas, Bismarck Sea and possibly the one west of the Marshall, for supply purposes.
That leaves 3 reserve CP (minus any extra put in the China Sea or the sea area next to Russia), that are spread out (as I always prefer them) between ports able to go to China Sea and the sea adjacent to Russia, Tokyo, Canton.
4 more will be needed to ship the 2 Malayan RP.
3 more will be needed to ship the 3 resources that Japan can hope to grab in China (Sian + the 2 south ones).
2 more will be needed to ship the Philipinne RP.
4 more will be needed to ship the 2 conquered NEI oil.
2 more will be needed to ship the Indochinese RP. Maybe only 1 if the railway is clear of Chinese units, but not likely.
That's 15 CP needed, so 7 to build if you count that you have 5 that you take back from the US / Japan agreement, and 3 in reserve. To start the Pacific war with a confortable reserve of CP (about 10), you'd better build at least 2 per turn since day 1.
Talking about builts, I like finishing all the 5 moving CVs and the heavy CV from the Cosntruction / Repair pool before S/O 41, and I also like finishing all heavy cruisers, who are a real bang for their money. I also finish the Yamato, for the solid target, and the occasional AA it provides.
I also like to begin the Pacific War (all be ready for S/O 41 at the latest, so that all is ready if USentry is threatening) with a minimum of 4 TRS & 2 AMPH, preferably 7-8 total of them, or the 6 plus 1-2 begun hulls. This is to allow for 2 full invasions on Japanese D-Day (Philippines & NEI), plus leaves 2 TRS for reinforcing garrisons and various duties accomplished on Japanese D-Day.