LED Control for complete beginner

Okay so i want to
use google assistant to trigger IFTTT with an ingredient that will mean color (ex: “Ok Google, Set lights to blue”)
IFTTT uses the ingredient and sends a POST API to whatever link i need (i dont know the link yet)
That link does a service and brings the parameter / ingredient with it and sets the lights to my desired color.

I basically know nothing about how to setup the config file to allow this to work (accepting parameters) and I don’t know how to send parameters through a post api.

Please help! Ive spent over 8 hours trying to get this to work