To get started on applying for an RMG, you need to find your Business Manager ID and your Ads Manager ID.
This guide will show you how.
How to find your Business Manager ID
You need to log into Facebook Business.
Find your Business ID -
Go to 'Business Portfolio Info' and you will see a number underneath your page.
If you follow my other guide you find out how to Add your Ads Account to your Facebook Business.
How to Find Your Ads Manager ID
Log into Facebook Business
After your Ad Account appears under 'Ad Accounts' you should be able to see your Ads Manager ID -