First off, now that i have the library set up perfect, it’s like watching a online streaming place.
After setting Show Movie Set, now all of my movie series like Back To The Future and more that i have show up in a group folder.
I did go online to collect some poster covers and then i choose art to all groups and adding a cover to each movie sets.
As for the fanart, I added them to a folder on my drive with all my movie and all, so i can later on the Kodi choose fanart to get a background.