npm init -y
Create a folder called src and add an empty index.js file. The code that webpack compiles goes in here including any Javascript modules and the main Tailwind file.
This will get you setup with Laravel & Valet on your Mac. Quentin Watt has a good video tutorial on getting setup here as well
Go to https://brew.sh/ and copy the command and run in your terminal
It will be something like this...
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"