The US has to take Santa Isabel, Malatia and evict the remaining Japanese from Guadalcanal on turn one. They have to get even on reinforcement points.
I think the Japanese are better off on turn 1 being in a position to contest New Georgia if necessary, they can get enough together to make it unattractive to the US, but moving the supplies back to build an additional airfield on the island they start with an airfield on. (Map is fuzzy in my head for some reason today.)
The game is short and both sides must move fast but at the same time remember they can’t win it on turn one. IMO.