What was the United States initial concerns during world war 2?

The European War had been going on for two years by the time the US entered the war; consequently, the US knew how to fight that war. The US didn't know how, when, where, or even why (to attack some areas) to begin offensive operations in the Pacific. When those areas were chosen, the US had to manage (ration) their warships and aircraft until US production could begin to replace losses.