If you mean chronologically, then probably after the Dawn of the Clans series, but before all the other books (possibly with the exception of Code of the Clans).
Yes, the TV series "Warrior Nun" is based on the comic book series "Warrior Nun Areala" created by Ben Dunn.
I think it is Tallstar of Windclan because he dies after the great journey when they reach their new home.
The entire warrior cat series are novels.
Warrior cats are not real, unless you are referring to the Warrior Book Series.
The first book of the first series of warrior cats is Into the wild.
The main character in the comic book series "Warrior Nun Areala" is Sister Shannon Masters.
The first book in the Rogue Warrior series is "Rogue Warrior" authored by Richard Marcinko and John Weisman. It was published in 1992 and follows the experiences of a fictionalized version of Marcinko, a former Navy SEAL.
Cloudtail became a warrior in A Dangerous Path.
The Lost Warrior by Erin Hunter is a warriors Manga book based on the Warriors Book Series. It is one of a three book series on what happened to Graystripe after he was 'kidnapped' by Twolegs (Humans).
Millie first appears in the Graystripe's manga series: The Lost Warrior. She then goes with Graystripe on a journey to find the clans, and turns up in the main series in The Power of Three book 1: The Sight.
Well he doesn't get a warrior name but a medicine cat name in the 5th book of the third series 'Long Shadow's', his name become Jayfeather.
The next book in the warriors series will be Sunrise.