I give up

After years of playing SH III GWX, then SH IV, at various levels of difficulty, I find SHO to be totaly unreal & utterly lacking in user info.
Every game needs a tutorial, but SHO has a totaly different set up & way of doing things, that is like sticking a fishing boat skipper into the position of battleship squadron commander, shove it, I'm off back to my Gato class in the Pacific.