With Germany, I will be attacking the USA atl fleet first turn with a submarine. I will be positioning my air force to ensure that the allies can not land in Europe or Africa the first turn (easy to do this time, since i will only need 1bomber and 3fighters in range to wipe out any first turn joint allied fleet that decides to move to africa).
With USA and UK, I will be buying shit tons of Fleet Defense, which will delay my landings by 1 full turn. Russia is going to be in a tight squeeze because of this.
Russia and Japan will be played pretty much the same, except that russia can count on any support through africa being 1 turn late.