Music won't sync to my iPhone

Ok, I just got a MacBook the other day, after having a PC. I'm not worried about my music transferring over. I put new music on my iTunes and when I drag it over to my phone, it won't sync! It is very frustrating because I want this music on my phone. I've tried everything the internet says to do. I've been to numerous web forums, you can't even imagine how many. I just want my music!

Have you tried to un install itunes and install it again to put your music on