I really think you need to re-read the CSV import instructions and follow the small tutorial they have.
It shows how to parameterize parts of the URL.
But yes, just create a header in the CSV file called UUID, and replace that part of the URL with {{UUID}}
Same process as we’ve used to target the other elements.
I would also suggest that you go through the Postman Learning Centre first which can be accessed on the Postman home page.
Those courses explain the basic concepts that I recommend you learn first. Including how to use variables.
Skip down to Postman Training on the next page.
From here, I recommend the Galaxy APIs 101, and Galaxy Testing and Automation as this covered all of the basics for me. This will include storing environment variables.
For more info on variables.