Facebook has made “success stories” available here, filterable by different areas, such as Business Size, Objective, Industry, Ad Product, and Region.
Basic best practice tips are available from Facebook here. Creative best practice tips specific to Stories ads are available from Facebook here.
There are many potential strategies for scaling. This article on our site covers two of these in greater detail. This article covers how to improve performance of ads through scaling techniques.
There is no single frequency appropriate for all situations, as it depends on a variety of factors. This article on our site covers this topic in greater detail. This article provides suggestions on how to manage it.
This article on our site covering how Jon’s evergreen campaign works provides a great overview of the possibilities for evergreen campaigns.