Graph API for accessing Mail Info

Hi PowerShell Community,

I need to access the info below 

1. Total Numbers of email by each mailbox
2. Total Attachments per email by each mailbox
3. Type of attachments (PDF, Word, Excel, PPT, Image, Etc..)
4. Total email, each mailbox
5. Last access
   For which i need to know which Graph API I need for the info mentioned above. Can someone please help us in finding this.