Northern Train Outfitters needs to ensure that "Valued Customer" appears if no data exists in that field for a subscriber when using a personalization string to display the First_Name field in a data extension. How can the Marketer most easily achieve this during creation of the data extension?

A marketer at Northern Train Outfitters has been tasked with growing its email subscriber
audience.
Which three best practices should the marketer keep in mind while trying to acquire
new email subscribers?

A marketer for Northern Trail Outfitters needs to share multiple assets in Content Builder for a campaign with another business unit in their account. How should the marketer share these assets?

A marketer for Northern Trail Outfitters needs to see test emails for each subscriber in a data extension.
What should the marketer do to ensure the data extension appears as a Recipient Test Data Extension in the Test Send menu?

Northern Trail Outfitters (NTO) wants to send out three emails In Automation Studio. However, NTO wants to ensure each email is fully sent before the next email begins sending.
How should the automation workflow be built to accomplish this?