Default Back to stock

Hello I have an xperia z c6602 I'm currently using pac man rom with meow kernel
My bootloader is unlocked and I want to go back to stock

I have a CWM backup of my stock rom. And a backup of my TA partition (i read it was useful)

How do I go back to stock? Can I just restore my CWM backup? Or I have to flash through Emma? How do I restore my ta backup?

Can someone be so kind to guide in a newbie way please? (I'm use to play around with Samsung devices. This is really different!)
Xperia Z