Learn about the CSV Datasheet HERE
Learn about the process to import a Deck below.
It is advised you start and create your deck.
It will guide you to import a CSV, then to upload the missing artwork.
It's simple and logical and has guided many people through the process.
Rely on the Checkist process to guide you to create and complete your deck.
You can create a deck and delete it if you make a mistep. Learn by trying.
The checklist is dynamic and will grow and shrink as you work on your deck.
Each items on the checklists links you to the place where you need fix the hilighted issue.