Yes, you must have iTunes if you get an iPod. The only way to get the software used to run your iPod is through iTunes, and the only way to do many things for your iPod is through iTunes.
You need to install iTunes from www.apple.co.uk You then click File then Add File To Library. You find the song on your computer and click open. Plug your iPod in and click File Sync iPod.
Done :)...
You can't. Apple has their products and things so locked up that Itunes is the only way to sync songs on it, unless you find another program on the internet that allows you to do so. Try searching...