Herr KaLeun put it well… just adding my opinion as well
I agree that the USA is the best option for you. They have a VERY high income, they are usually easy to play, especially because you almost never have to defend your homeland. The only difficulty playing as the USA is being able to help your allies fast enough. The USA is a pretty loose nation strategy wise, so you should be fine with making some mistakes as long as the USSR player isn’t terrible. Sea battles, sorry can’t help you there. Almost every nation except the USSR has sea battles at some point.