about online game like fortnite server

iam just now developing game similar look like fortnie iw was battle royal iam just asking whats the the name of forntnite server and how can i do my game online lie fortnite and have a custom launcher for my game and how i made update and showing it for clients automaticly when i add a new things and whtas the budfet for the server iam sorry for alot of question but if u can help me to solve this please or finding a ways to understand that

Sounds like you don’t know what you’re doing, I would try to do a very simple project instead that does not involve online multiplayer.