@armingdev check this thread: https://stackoverflow.com/questions/50035393/real-time-notification-using-laravel-as-back-end-api-and-angularjs-as-front-end
I think if you follow that, you will have a foundation on what are you trying to do and from there, do some modifications to meet your requirements.
Your question is a bit broad but my suggestion is to just start doing the basic requirement of that notification based on that thread I shared and add the necessary features as you go along. Good luck!