Create new user in AD & Exchange Mailbox in On Premise using PowerShell

Hello

Using PowerShell I want to create script for following tasks

1. Create AD Account & Exchange Mailbox in on-premises and Sync new AD Objecy with Azure coud and assign license

2. Based on the new AD object time stamp, want User mailbox migrate to office365 cloud and assign license, litigation hold etc
3.. Once creation is completed email should trigger to user or manger on the id creation
4. How to delete AD Object and recover the license

5. Is the possible that Office365 mailbox will be put on in-place hold for eDiscovery using PowerShell?

Please advise

Avian