Before you can sideload an official Google apps such as chrome or the Google play store you must install Google play services

Download and install  google play services then install the play store and whaalaaa... 
Latest Google play services: https://developer.android.com/google/play-services/index.html

Google play store: http://www.androidapksfree.com/apk/google-play-store-apk-latest-version-download/