Install Node.js 4.0.0 or higher
Add an editor plugin for your editor of choice.
Not required, but highly recommended: install elm-format and integrate it into your editor so that it runs on save.
Run the following command to install everything else:

npm install -g elm@0.16.0 elm-live@2.0.4 elm-test@0.16.1-alpha3 elm-css@0.4.0

This command could take several minutes to complete.

Clone this repository

Run this at the terminal:

git clone https://github.com/rtfeldman/elm-workshop.git
cd elm-workshop

Start with Stage 1

Run this at the terminal:

cd stages/1

Now head over to the README for stage 1!