Q: how can u download iTunes to the ipod

Just what to you mean? There is an iTunes app on the iPod and that is were you purchase music and other similar media. The is a Music app on the iPod and that is where you play music

- What iOS is on the iPod? Settings>General>About version. A 1G can go to iOS 3.1.3 that yo get here:

Connect the iPod to your computer and update via iTunes

iOS: How to update your iPhone, iPad, or iPod touch

A 1G iPod can go to iOS 2.2 via iTunes and iOS 3.1.3 via

Purchasing iOS 3.1 Software Update for iPod touch (1st generation)       

https://buy.itunes.apple.com/WebObjects/MZFinance.woa/wa/touchLegacyLandingPage

- If you have iOS 1.x you may not have the iTunes Store app.

The iTunes app can be hidden by Restrictions. Settings>General>Restrictions