Trying to connect a microphone over two NodeMCU to a LED

My granddad is deaf and want to see a light, if in an other room is a sound.

I have two NodeMCU, a microphone and a LED ans I want to connect the two NudeMCU with the Wifi to let the LED on the one Node light, if the microphone on the other Node hear a loud sound.

My problem is, that I never programmed a NodeMCU and I didn't found a good tutorial or code to do what i want. In witch mode should the NodeMCU be?
Do you know how to this and can you help me to write a program?

Thank you!