Coordinate Outlook among three to four different accounts

I am an advertising/marketing freelancer with multiple clients with Outlook as their primary base of operations.

I would like to sync all calendars to one
I would like to understand the best way to get to each's SharePoint
I would like to understand the best way to get to each's google drive
I would like to understand the best way to get to each's good analytics

I would like to do this on a screen share together.