How to download music onto my IPHONE 5 from the computer?

I'm trying to figure out how to download music onto my IPHONE 5. Like what I do I do when I hook my phone up to the computer because nothing is showing up where I can sync it. Or do I have to do something on my Iphone to be able to sync anything?

You need to download music in mp3 format first.
go to www.albumatom.com and download any album you like
then transfer that to itunes and sync the files to your iphone

There are two methods for you to choose:
1, First of all, download the music to your computer with mp3 format and then use iTunes sync the file to your iPhone.
http://www.apple.com/...om/itunes/
2. You can also use xilisoft iPhone magic which is also a powerful idevice management tool.
It is a more convenient and an easy-to- use program.
http://www.xilisoft.com/iphone-magic/tutorial.html