Just one Gmail for your business
Yes, that's correct. One gmail account for your business. It stops staff "taking things offline" and keeps everyone honest. Use filters and folders to have emails skip the inbox and auto populate into staff sub inboxes. Make sure everyone clears their "inbox" so if absent, their role can be easily covered.
Anything personal for the CEO can be sent to your personal inbox.
it also shows a transparency to the business. The staff will appreciate this transparency.
This advice is valid until you need an human resources department.