The scenario is designed to be played as Japan. I have used events to make the scenario 
challangeing. 
As for how good the units are, just look at your defense minister (F2). As Japan you can build
two types of infantry, two types of aircraft, and many ships.

Objectives: Starting out your going to need to use either aircraft of ships to neutralize Korea.
Then with transport ship men over and occupy. Use the same strategy for capturing the South 
Pacific islands. Go after Okinawa, Guam, Marshall, Mariana, Gilbet. Don't conquer anymore islands
until you own the Philippines. If you declare war on either America, Allies or Russians, then 
you'll find yourself very quickly at war with the rest of them. So don't take the Phillipines 
untill you think you are ready. In the meantime, attack Manchuria and China through Korea. 
Use your labor force to build railroads for a quick strike. Sometimes when you kill enemy infantry
a labor force will pop up in Hiroshima.
For town management you should put all specialists to tax collecters. Japan has a low manufacturing
rate compared to everyone else. To keep up you shouild use your money to buy Coastal fortresses,
airports, portfacilities, and units. 
One big advantage you'll have over china is aircraft. The outnumber you in soldiers so if you try
to fight them that way you'll never make it. Another advantage is your boats. You have a super
battleship that will unmatched by anything the allies have. However, if it is by itself at
the edge of your empire, there is a good possibility it will be swarmed. Although it is great
it is not invincible. Two battleships can take it out. 
You also have super cruisers that are a little better than normal cruisers.
Well that's it and good luck. Please send any comments to mjeszenka@usa.net