Hello, been using this on my local network for years.
I now have this on a VPS, I would like to allow the DHCP server to cater for 12000 - 20000 daily users.
What IP range should I use and where do I make that particular edit?
A step by step guide would be fantastic 
You can use this as a reference (for subnet settings)
https://www.aelius.com/njh/subnet_sheet.html
(for 32768 unique IPs you would need a /17 )
Once you have the router set-up to support that subnet, you would set the parameters in /etc/dnsmasq.d/02-pihole-dhcp.conf or via the admin interface.
But before you do that, are you sure your hardware will handle all that ?
That's a hell of a huge load, close to ISP grade and it will require some serious firepower to handle all that, in real time, without any delay (one one branch).
I am not running this on a Raspberry Pi 
PS: Thanks so much for the help! -- /etc/dnsmasq.d/02-pihole-dhcp.conf is what I was looking for!
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