How can I apply cloudflare on vultr?

I’m trying to apply cloudflare on my game server (vultr) since they don’t provide ddos protection for the Seoul region. Is there any specific guide that can help me setting up cloudflare?

Cloudflare doesn’t proxy game server traffic by default, as it’s not HTTP/S on these ports:

There are options to proxy Minecraft (expensive) or any other traffic (super crazy expensive).