How to sync my iphone to itunes?

I have a iphone 3g I need to sync it to iTunes, anyone help?

Download iTunes on your computer if you haven't already, then plug your USB iPhone charger into your computer and open iTunes. It should start syncing.

Plug a USB into a computer USB port and open up iTunes on the computer. And it should take a minute and it should say iPhone in the top right corner click sync and there you go.