What type of internet usage and router would i need to host a dedicated 64 player gaming server?

This is a server for the game Garry's Mod (Gmod) | I would also like to know how much bandwith it would use

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).