Due to Facebook's policies, you need to have a personal account with admin rights to access a business page.
Due to how Facebook works, admins are needed to control the business page as business pages cannot be logged into directly without first logging into a personal Facebook account.
First, you will need to decide who is going to access, post, or modify your business page and assign them admin rights. The best approach is to give admin rights to people who you want to have them.
Before a person can be added as an admin on a business page, that person will need to "Like" the business page. After this, their email address used to log into Facebook will be used to assign admin rights to that person's personal Facebook account.
These new admins may not want to have their personal Facebook page associated with the business page. That's fine! They can create a "work Facebook" account that is not associated with their personal page.
A "work Facebook" account is a new personal Facebook account that is created to be reflective and representative of that person's work identity, similar to the professional nature of a LinkedIn profile.
Giving admin rights to a personal account does not combine the business page and the personal account. This is reversible and currently how Facebook has set up their rights and permissions currently.
Note: If you lose your login credentials to your admin account that is used to control your business page, do not create a new business page! It is better to try and gain access to your original Facebook business page instead of creating a new business page, which can be confusing for your candidates and clients.