Good to see 90% got it right so far.

Confirm the namespace ID in your rsreportserver.config file.

Yes, the runtime redistributable, or the alternative, just sending them a generated PDF 😉

The MSI to deploy is called ENU\x64\SQLSysClrTypes.msi, and part of the SQL 2014 Feature pack - https://www.microsoft.com/en-us/download/details.aspx?id=42295
You'll need admin rights to install yes.

1. Restore the principal DB on your sSecondary instance with NORECOVERY
2. Restore a transaction log backup to the secondary also WITH NORECOVERY
3. Make sure the mirroring endpoints are...

No one can advise you on what index is needed without seeing your queries.

Use the stairways - http://www.sqlservercentral.com/stairway/72399/  on indexing, this will help you understand how to...

Log Shipping is controlled through an executable "sqllogship.exe", so I don't see how you can change the output format, unless you create a manual process with T-SQL or PS.
For...

As Grant said, Powershell is your friend. 

Start with defining a central db where you'll store all your collected data and tables to store data (redacted for your requirement...

You can run this as a job every x minutes to check for a specific job name, it will also omit any current running version of this job.

Not familiar with the PS method you posted, but I know there are alternatives to acomplish this:

https://github.com/dapaxx/reportsync
http://www.forrards.com/howtoeasilymigratessrsreportsbetweentwoservers/