If you've never used this before, make sure you:
sudo npm install -g yo
sudo npm install -g gulp
sudo npm install -g generator-lawline
Switch to your furthered-vagrant/sites/designs folder and run:
Follow the onscreen instructions and then cd into your new project folder and run:
Make sure you have the LiveReload Chrome Extension.
Load up http://localhost and any time you edit index.html or a LESS file, the page will auto-reload.