I would recommend using any third party platform to manage the data like a PIM or any catalog management system that allow a direct API integration, using csv upload for 13k product will be hard.
I am using Plytix so I have a direct connection and once product is edited, there is an automated push to my store keeping all updated. You can check it here.
If you are using csv method, you can see in the video what type of attributes are mandatory and which ones are optional, and the format necessary to avoid any errors while uploading. Make sure to test your template with fewer products before including all in one batch.