You should read, and then you'll have to check the boxes indicating you agree to the Google Play's terms and conditions. There are many additional assets you could provide, such as videos and larger promotional graphics. You can set a price and currency options for your app if you've set up a Google Checkout account.
As noted above, you'll need at least two screenshots to publish your app. You can grab those with DDMS. With your Android device connected or emulator running, open ddms and select your device in the top-left pane. Choose Device, Screen Capture. Save two representative screenshots to your desktop or home directory. Close ddms. Disconnect your device following your operating system’s procedure for safely removing USB devices.do this by running your app in the Android emulator and clicking the "Take screenshot" button (which has a camera icon) from the emulator's toolbar.
- Google Play Developer Program Policies
- Google Play for Developers: Graphic Assets for your Application
- Google Play