A little setup in googlesheets is required, you have to deploy your googlesheet script as a webapp (which generates an endpoint for you starting with “https://script.google.com/a/macros/…”), and your script has to reckon with the data coming in (via googlesheets’ doGet and doPost functions).  I noticed that googlesheets’ script legacy editor seems difficult with generating these webapp deployments, so you should try doing it in the new script editor.

As for Netsuite side, it should be as simple as making an https.post request to the googlesheet endpoint you generated.  I say “should” because I’ve personally only posted data through an html <form> from the client side rather than via the N/https module.