Here’s an edited list I made for a friend a while ago, of the essential Clone Wars episodes - but this is for someone who’s never seen the show. (Friend in question still hasn’t got past the Umbara arc)
https://drive.google.com/file/d/1EWF6Om1ZPZBE0g-g_8fHnU25PqPecIUB/view?usp=sharing
I hope this Google Drive link works. I would have just typed out the episodes to contribute to the thread, but when I was making it, I enjoyed collecting all the images so much that I spent ages doing it, so now I figure I should just send the original document.