@Glamorboy A big load of subs can definitely be useful, and if you aren’t trying to protect transports at all, it is a good option. True, one carrier and 2 fighters loses to 5 subs. Typically though, your navy will be much more expensive than $34 and the fighters are also relevant on land. Also, subs are not good at defense while fighters defense kings.
When I play against friends who are new, I just give them a bid. If they win, their bid goes down and if they lose, their bid goes up. I never spend money on both coasts as US because I feel like I can never get anything going at all and it seems like all the money is wasted. Also, I think it is more helpful to use viable, typical strategies against new players so that they know what to expect. I have learned a lot more about the game through losing than I ever have by winning.