Simple..... ASK! and you shall receive. So here's the details... 1. £20 for version v1.01 2. £10 Subsequent revisions published (no two revisions can contain the same version for production APK's) 3. Supply me the following items: Name of app (max 2x8 characters) A Logo of your own design (unique) 128px x 120px in PNG or JPG formats only. A splashscreen (also unique) banner at orientated in a vertical rectangle. at least H -1024px x W-768px. NOTE: Both images MUST be hosted on your Joomla site in your media manager, suggest creating a folder just for the app images. The root URL of your website and up to three (3) additional URL's for the click-able (in-app menu buttons.
Proposed audience rating for your website, see below link for more details. https://support.google.com/googleplay/android-developer/answer/188189?hl=en-GB
Lastly review the most likely permissions your site will require in accordance with Google's Android application permissions guidelines. https://support.google.com/googleplay/answer/6270602?hl=en