How to tranfer my laptop music to my iPhone?

I have the newest iTunes update and I would like to transfer all of my songs to my iPhone

You need to sync your laptop with your iPhone.

http://support.apple.com/.../kb/HT1386

If all of the songs on your computer is indeed yours, then all you need to do is sync your iphone or any ios device to your computer. ITunes has a tutorial that shows you how to do this step by step.