(If any commands fail, try either restarting your console or running them with sudo)
Make sure you're in the project directory first between executing these commands
Get Composer (PHP dependency manager)
Install composer packages
composer install
Get NPM (Node Package Manager)
Then install Bower Globally (Bower is another package manager...)
npm install bower -g
Then install Gulp Globally (Gulp compiles sass, concat files, minifies, etc.)
npm install gulp -g
Install Bower Components
bower install
Then start gulp watch (watch the filesystem for file changes so it can recompile)
gulp watch