IPhone 5 screen replacement? - 1

I'm trying to repair my iPhone's screen myself and I'm not sure if I'm supposed to buy the outer screen or the screen with the LCD touchscreen.

By the way the screen is cracked on the bottom left corner near the home button. It's kind of mild not so deep but can barley feel the cracks.
So which screen do I have to buy?

Already broken your iPhone 5 screen? Haha. It happens I guess. I know iScreensFix.com sell a repair program which shows you everything you need to know about replacing your screen, including what screen to purchase. I recommend them highly, as we used this to replace my mum's iPhone 4s screen last year.