Blueprints multiplayer. Player controller.

Hello, i want to take actors from map in map blueprint and write them in variable in players characters or controllers to get them location. But when i use get player controller with id 0 its work only for server. Can any body say how am i need to use player controllers in online smt like to ban gamer to give only for this player smt. Am i need to create a players controllers at the game start?
Thank you. This is example what i want to do.