Facebook ad manager is a tool for creating custom ads and managing campaigns on Facebook. It enables you to create different types of creatives such as image or video, target audience with age, location, gender, etc., allocate budget accordingly for the campaign and generate reports.
"Here are the few basic steps that will help you get started with Facebook ad manager:
Go to your Facebook page then click the “Create Ads” menu option under it;
Create an account if you have not done so;
Then choose a business objective from available options;
Select who your target audience is and how you want to show your advertisement;
Then select an existing ad set or create a new one.