Posting your first app onto playstore? Here's the list of things that you need to do

By default, apps developed are signed in debug mode by a special debug key. This is not allowed when uploading the application to playstore. You need to sign your apk before uploading to the playstore. Information related to signing process can be found here. This points to the Android developer link which has extensive information.

If you are running short of time and want to quickly finish off generating the key and signing your app, then you could head straight to here.

Once you have the keys ready, the next step will be generate a signed APK. If you are using eclipse then the information is available here but if you are using Android Studio, you might have a tough time finding the information. The screenshot on the right is self explanatory.

Once you have a signed apk ready, you can upload the same to the playstore site. There are little other things that you need to take care of, like the screenshots, application icon. I don't think those need an explanation. Everything else is self explanatory on the playstore.

Happy Publishing your app to the playstore.