[Hidden-tech] Question re Office 365 - Outlook

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I consider myself pretty tech savvy BUT. 

I have an existing office 365 business account/package that I use for my hobby business. That account is tied to an email and custom domain which I own. That domain doesn’t have a website and doesn’t need one. (Yet)

I am re-starting my law firm as a part time business. It has its own domain name and will have a website. I will need to use the office 365 software to run the business and will need to use outlook for email contacts calendar as well. 

I also have inherited my late dad’s office 365 home account which is paid up through July 2024 and uses an old .msn email address. That account owns licensing for word, excel, outlook 

I’d like to talk to somebody who is smart about this stuff about options for the new law firm. Do I set it up as an additional user on the hobby account? Do I convert my dad’s home account into a business account?  Do I buy a whole new office 365 account for the law firm and start from scratch?

Or??  Please don’t suggest using Mac or some alternative platform because I am too old to dump the Microsoft stuff. And thanks in advance. I don’t expect free advice, happy to pay for consulting and expertise. 

Kristi 

Sent from my iPhone