In order to run marketing campaigns on Facebook, Instagram, WhatsApp, Messenger and Audience Network - you'll need a Facebook Business Manager to manage ad accounts, campaigns, roles, permissions, apps, pixels and a lot of other assets.
We put together a video tutorial with step by step on how to set up a Facebook Business Manager (updated for 2020).
Have a look at this tutorial to do a proper setup:
Once you're up and running with your Business Manager, ad accounts and marketing campaigns - make sure that you're automating your Facebook Ads properly to maximize performance and utilize the power of optimization.