Zoho inventory process - How to

Zoho inventory process - How to

I can not manage to understand very good the process I should follow.

Right now.

Estimates -> Sales Order -> Package created -> Package sent -> Package delivered

Customer gets notified once the package is sent and then another time it gets delivered. In both emails a PDF includes the shipment details in a PDF. 

The thing is, I want to record each time the clients receives a package. What kind of delivery note should I use? The one on the Zoho Books module? Or should I rename the Shipment PDF to Deliver note and delete the PDF included?

Then our company trucker will get 3 papers, one for Packing Slip (glued to the package). The invoice needs to be signed by the Client and the delivery note also needs to be signed by the client. Is this process correct?

Is there also a possibility for the client to digitally sign these documents?