How to sync my music to my iphone 4s?

Ok, so first of all, I have a Windows 8 computer. I downloaded iTunes onto this computer. Next, I downloaded songs from YouTube to mp3 converter to my iTunes account (by pressing save file to iTunes when downloading). The problem isn't necessarily getting the music to the iTunes, but getting these same songs to show up on my iPhone 4s. I signed into my iTunes account on my phone and the only music it is showing is the ONE song I actually purchased FROM iTunes. How do I get the rest of the music to appear onto my phone? I allowed for home sharing, I authorized my computer, my USB cable is plugged into both my computer and my phone, I just don't understand what I'm doing wrong, someone please help me, I want my music!

We aren't here to help you STEAL.

Download iTune

You need to download iTune or you can use Windows Media Player, these player already have built-in sync feature.

You may get a tool named TunesGo for help.

http://www.iphone-to-mac.com/tunesgo-iphone-ipad-ipod-manager.php

I used it to transfer my songs in my iPhone 4s to my Windows 8 PC, it worked like a charm. You may also give it a try.