iTunes is only for iPod's, the instructions on how to fill your Sansa here
http://www.experts-exchange.com/Apple/Hardware/iPODs/iTunes/Q_24351014.htmAs for the ripped CD most likely it's location is iTunes default C:\Documents and setttigs\%user%\My music\iTunes\iTunes Music
You can access from the start up menu clicking My Music then openning iTunes folder & iTunes Music folder.
the problem you may face is that itunes ripped the CD to ACC>mpa and Sansa won't play it.
To rip Cd's to mp3 Use Windows Media Player
From the menu > Copy, open the drop down menu, Format>Select mp3, Format>Select Bitrate>Select your preference, the smaller the number the smaller the file & less quality. Format Copy the CD automatically when inserted I've chossen "Only When copy is selected".
The description may be different i'm using a spanish version of Windows XP