I worked really hard to create my own items and a small module... where can I find the files on my computer so I can back them up.

Please help.

Thanks.

also, what file contains my saved characters?

Your modules should be in the folder called "Modules". Just save them under another name or archive them using Windows Explorer.

Your characters are saved in the folder called "localvault" (if you are playing single-player games a copy of your character is also stored in the savegame). If you were hosting a game and set it to server vault only, then everyone playing your module would have their character files saved under the "servervault" folder.