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As Simon says you can’t move any of your ships in that sea zone on NCM. There is a provision that allows you to move them to flee the sea zone on the Combat Movement phase without taking them into combat. The real purpose of the move though is to prevent any transports in the sea zone from loading ground units in that sea zone. You can still move to another sea zone on Combat Move and load ground units as long as it is a friendly sea zone. If you haven’t seen the video it explains everything; https://www.youtube.com/watch?v=Pkj_9K3lfQk&t=166s
Question: can I buy something but not place it on the board until my next turn?
My buddy bought 3 transports then proceeded to attack me with his navy but I wiped him out. Placing the transports on the board will just lead to me sinking them easily on my next turn since nothing will be able to defend them. Can he hold them until next round?
No. He has to place them. Hopefully there’s more than that one IC to place them so they are not destroyed before his next turn. But he cannot “hold” them. They must be placed on the board. At least that’s how we’ve always played it.