Just remember that unless you are optimizing for Japan on turn 1, you really do not have to try to do everything at once.
I started playing WitP in 2004 and AE when it was released, latter game, even vs. AI, is way ahead. Even AE AI has load of scripts that will make your life as commander difficult. In Grand Campaign, IJ AI works lot better that Allied AI, since later was amphibious operations can get really difficult to handle.
Guadalcanal scenario is good way to start...and if you really want to lose your mind, get DaBigBabes mod for Grand Campaign.
"To meaningless French Idealism, Liberty, Fraternity and Equality...we answer with German Realism, Infantry, Cavalry and Artillery" -Prince von Bülov, 1870-