Turn by turn system for a game

Hello, I’m a bit of a beginner on Bubble and French, sorry for my level in English.

I am trying to set up a card game. I’m stuck on one thing: setting up a system where you switch from player A to player B once his action is finished. I would just like to know how to set this up.

Another thing that bothers me is that when player A uses a card that causes player B to lose points, player B can use a card to defend himself. I guess it’s the same system as my previous question, but I’m wondering how to give one player the hand to initiate an action and then give the hand back to the other player to continue his action.

Thank you very much for your answer, I would really like to understand how to set this up !