Download and install "Android Studio": http://developer.android.com/sdk/index.html
Ensure that have the next environment variables in your PATH: ANDROID_HOME JAVA_HOME
Create an Android device emulator with the "AVD Manager" or with: $ android avd
Install Apache Crodova: $ npm install -g cordova
Install Ionic 2: $ npm install -g ionic@beta
Create the project: $ ionic start holaMundo --v2
♬ ♫ ♬ ♫ Your Ionic app is ready to go! ♬ ♫ ♬ ♫
Make sure to cd into your new app directory: cd holaMundo
To run your app in the browser (great for initial development): ionic serve
To run on iOS: ionic run ios
To run on Android: ionic platform add android ionic run android