Hi bajak101,
Thank you for posting your enquiry to the Apple (user-to-user) Community.
As we are all Apple users, doing what we can to help each other one-to-one with the various problems that users encounter, advice on purchasing and benefits for business may be beyond many of us.
Am no expert in this field, yet your enquiry surely deserves some response.
You may want to browse the info. below to choose which aspects seem relevant and worthy of your attention.
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Re: "from what I understand, you will get better prices the more you buy?"
We cannot speak for, or make promises for Apple ...
For Apple's info. on how best to buy multiple computers for business, you may need to start from the link below:
Business - Enterprise - How to Buy - Apple
Also:
You can find out which Apple programs and payment methods for business are available in your country or region:
Availability of Apple programs and payment methods for education and business - Apple Support
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Re: "if it is the way to buy devices, is there a way to like edit the business information, or add another authorized purchaser?"
To put your business on the map:
Apple Business Connect is a free web-based portal from Apple to help you easily manage, measure, and grow your business. It allows you to set up your business so customers can find it in Maps, Apple Wallet, Siri, and more
Apple Business Connect User Guide
Apple Business Connect User Guide - Apple Support
You can add new businesses to your company in Apple Business Connect or update information about the ones you’ve already configured.
Add a new business in Apple Business Connect - Apple Support
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Re: "If someone could explain to me the benefits, that would be great".
Businesses come in many different "flavors", so it is not easy to guess which benefits could suit your company:
Eg: You can automatically enrol devices in your mobile device management (MDM) solution without having to physically touch or prepare the devices before users get them.
Deploy devices using Apple School Manager, Apple Business Manager, or Apple Business Essentials - Apple Support
More info: User Guide: Apple Platform Deployment
Apple Platform Deployment - Apple Support
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You can: Get Volume Purchase Program (VPP) Credit securely from Apple
After your organization buys VPP Credit from Apple, your content purchaser can use the secure inbox to view order history and download redemption codes.
Get Volume Purchase Program (VPP) Credit securely from Apple - Apple Support
Business organizations that are enrolled in Apps and Books for Apple Business Manager, or Apple Business Essentials, can use VPP Credit as a way to buy apps or books.
VPP Credit is one of several ways your company / organization can pay for volume purchases.
More info: Get Volume Purchase Program (VPP) Credit securely from Apple - Apple Support
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AppleCare for Enterprise : Priority onsite service and 24/7 support help keep your end users up and running
AppleCare Professional - Enterprise Support - Apple
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More business support:
Apple Business Essentials is a free app to get the apps and support you need all in one place.
"The Essentials app is automatically installed when you sign in with your Managed Apple ID that’s enrolled in Apple Business Essentials device management". About the Apple Business Essentials app - Apple Support
All the best :-)