I'd like to know what procedure I should follow in order to be able to post my App on my site and users can install without having to enable the "Unknown Sources" option within the Android Security menu.
If anyone could help me I would be very grateful.
Diogo, on Google's recommendation and convention, it is not possible to release an APK outside of Google Play and still be considered "secure". You can easily send the APK to your friends, but this message will continue to appear.
You can either sign up for the app on Google Play in beta or alpha and release to only one user group, see this official link .
Hugs!
If it's a public app, the best way is to publish to the playstore itself.
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