1. As far as I know, there is no specific standard for the privacy policy. You can have a look at the policies of other reputed apps to get an idea on how to write it. There is no hard and fast rule of the writing style either (remember, this is neither legislature nor a court of law). I think the policy should be written in simple and clear English that everybody can understand. Many of the free privacy policy generators use legal wording, which I want to avoid unless absolutely necessary. It is good to mention the following clearly in the privacy policy:

   • The data your app stores, and which of these is "personally identifiable information".
   • The data your app transmits to your servers.
   • How the above data is used.
   • Whether it is possible to request deletion of this data.
   • The permissions that your app use, especially if you use any sensitive permissions like READ_EXTERNAL_STORAGE.
   • Why the app requires those permissions.
   • How you want to be contacted in case someone wishes to ask for clarification/deletion of data/report security vulnerability.

2. In the Play Console, first click on the app. There is a left pane with many options like Dashboard, Inbox, Releases, etc. Scroll down on that pane to the bottom, and there you will find "App content". Click on that, and you will find a place to add a link to your privacy policy.

Note that the privacy policy has to be uploaded somewhere else, and you can only put the link to it in Google Play. My apps, for example, are all open-source, so I have uploaded the privacy policy to GitHub and linked to it. Another good option, if your app is closed-source, and you don't have a website, is to create a single GitHub repo for all the privacy policies of your apps, and then individually link those files in Google Play and in the app.