How to transfer music from itunes to iphone 4s?

I need help i have a dell latitude and i just updated my itunes and i can't figure out how to transfer my music onto my iphone 4s that i just got. Can someone please help me! As soon as possible

Plug your iPhone into the laptop. Click on the iPhone button in the top right corner. Then sync whatever you want xx

Easy, just select file - add and add any mp3 etc into your list (can be any songs you already have from elsewhere, etc). Once its in your list just sync or copy to the phone.