Laravel Chat System RESTful API

I spend last days searching on how to develop a chat system API to be use later in Mobiles , I searched a lot and there no clear tutorial that give me the required answer , since I am new on laravel and I can't figure out all the aspects in the laravel and web development , can someone please help me and give me the instruction how to start and what notification system do i need to use Pusher or Firebase Clouding Messaging....