You need a personal Facebook account to create a Facebook Business Manager account. This is done because it will be safer to log in via a personal Facebook account than just entering an email and password.
Step 1: Create a Business Manager Account
- Go to business.facebook.com/overview
- Click Login in the upper right corner which functions to connect you with the Facebook account that you have
- Login to your personal Facebook account by entering your Facebook email and password
- After login, click Create Account button
- Enter a name for your business, your name and work email address and click Next
- Enter your business details and click Submit
Step 2: Confirmation Email
- Open your email and click Confirm Now to confirm your business email
For detail information, you can refer to these link: