Getting started:
npm install -g cordova ionic
You will need an Ionic account to upload and view the app on your phone through ionic view Follow this link: http://ionicframework.com/docs/cli/uploading_viewing.html
To run in a browser (compass won't work because desktops don't have a built in compass) ionic serve ionic serve --lab ionic emulate android or ios (for this you need xcode or android development tools installed)
You can use the SASS file which is a part of Ionic - Ionic has great documentation on all of the steps you will need to customize your app
Pro Tip: Focus on one platform first (Android or iOS) BUG: (only with iOS) On lines 168 & 169 in controllers.js, you need to set 'trueHeading' to 'magneticHeading' for compass to work