What were the Roman generals assigned to do to a country once it was seized?

Read lots, both in your text and in these search results:

https://www.google.com/search?q=roman+generals+duties+once+a+country+was+conquered&oq=roman+generals+duties+once+a+country+was+conquered&aqs=chrome..69i57.12225j0j7&sourceid=chrome&ie=UTF-8

Let us know what you learn.