You can use your shipping rules to automatically print handwritten notes at the same time as your shipping labels.
In your rule's settings go to the advanced settings section and scroll down until you see the Generate Handwritten Note? setting.
You can use this setting to select which template to use when generating a handwritten note for your shipment. If a template is selected, then a handwritten note based on that template will be generated when your labels are printed. Where the handwritten note is printed is dependant on the Note Printer setting in the note's template settings.