You have to import the characters, not just drop them in the Characters folder. Hit F10 to open the resource manager, find the file, then click import. You then Left-Click to set the transparent (the background color) and Right-Click to set the translucent (shadows).
If by ultimate interior/exterior tileset you mean one that has all the interior and exterior tilesets in one, the file is generally too large and locks the game up.
If you mean a tileset with all the exteriors and a separate tileset with all the interiors, then I believe there are some in the database. Have you checked there?
As for animations, I can't do those very well, so I can't help you.
In the future, please put different requests in different threads.