What do we have to prepare before upload in Google Play

Create these your application icon for various dimension in png format:
  1. xxxhdpi 192 x 192 px
  2. xxhdpi 144 x 144 px
  3. xhdpi 96 x 96 px
  4. hdpi 72 x 72 px
  5. mhdpi 48 x 48 px
  6. Hi-res icon 512 x 512 px
Create a Feature Graphic with dimension 1024 w x 500 h in JPG or 24-bit PNG (no alpha).
Create screen shoot for your application.
These are steps to publish your application from Google Play Console:
  1. Create application
    1. Title
    2. Short description
    3. Full description
  2. Upload APK via App release (you need to build your APK using signed key in Android Studio and change compile for debug to release)
  3. Content rating
  4. Pricing & distribution