How to publish an app

Common requirements

logotype
tagline
AppStore and Google Play description; AppStore previewer
AppStore (100 characters max) and Google Play keywords
screenshots for AppStore (iPhone 3.5in Retina, iPhone 4in Retina, iPad Retina) and Google Play (smartphone, tablet)
icons
- AppStore guides
  - 29x29, 29x29@2x
  - 40x40, 40x40@2x
  - 50x50, 50x50@2x
  - 57x57, 57x57@2x
  - 60x60, 60x60@2x
  - 72x72, 72x72@2x
  - 76x76, 76x76@2x
  - 512x512, 512x512@2x (Artwork)
- Google Play guides
  - 36x36
  - 48x48
  - 72x72
  - 96x96
  - 512x512 (ArtWork)
  - 1024x512 (optional, for recommendations)
  - 180х120 (optional, for ads)
(optional) splash screens

Apple Developer account
iOS Dev Center
- create developer certificate
- create an app (App ID)
- create provisioning profile (for distribution in AppStore) for an App ID
iTunes Connect
- create an app and fill in description, screenshots, etc
- prepare for binary (Xcode archive) upload
Xcode
- add icons and (optional) splash screens
- check deployment targets, devices, app version (numbers and dots only)
- select provisioning profile (for distribution in AppStore) and code signing identity
- Scheme: iOS Device
- Product > Archive
- Organizer > [app] > [archive] > Distribute