You have to create a new GameMode blueprint class and inside it you set the PlayerPawn value to the CameraPawn you created and the PlayerController value to the Controller you created. Then you have to tell your level that you want to use this game mode :
You can override the current game mode of the map in the world settings of your level. Or you can set this game mode as the default game mode for every map in the Project settings → Maps and Modes section