Domain and Mailbox Setup Recommendations for GWorkspace and O365

Does anyone have recommendation for domain/mailbox setup for both gworkspace and o365? We use Apollo as our sequencer. We don't do mass sending so it fits our needs just fine for the moment and we are not looking to switch. But we are looking for automation (or even a contractor who can do it for cheap) for spinning up new sending infra. The service doesn't need to be fully automated and we do want direct access to domains, dns, accounts, and mailboxes.