There are several options for managing frequency. This article on our site covers this topic in greater detail.
How can I run my ads during certain times of the day (dayparting)?
Details on ad set scheduling are available from Facebook here. Context on how this works is available from Facebook here.
How do I create an unpublished/dark post on Facebook? How do I publish an unpublished post?
Unpublished/dark posts are created when you create an ad in Ads Manager without using an existing post from your page. This article on our site covers how to publish unpublished posts to a Facebook page.