My iPhone 4S is not working anymore

So my little sister took my phone without my permission and I chased her to get it but when I tried to snatch it from her, it slipped out of our hand and fell and landed flat on its face on my tiled kitchen floor. The thing is its screen was already cracked about a month and dropping it made it worst and when I picked it up the screen wasn't working anymore, and I mean like it turned black. I know the touch screen is still working because I can hear it when I'm typing my passcode pattern ( which I memorized) but I just can't see anything. I looked up online on how to fix it and I found a helpful video on how to change another screen and my question is would buying this item ( The tools and a LCD screen )http://www.ebay.com/...1328192401 help with fixing it or do I need something else? I don't want to spend a lot of money to get it fixed so ill try to do it myself… Can someone / a professional with phones help me with this? It's an IPhone 4s btw. Thank you in advance (:

Added (1). Please READ ALL! BEST ANSWER GET 10 POINTS

Added (2). And this is the link once again. Just in case

http://www.ebay.com/itm/271328192401

Added (3). I can't get a new phone my dad won't do it and I don't have insurance, and also I've been having it for over a year so the warranty's been over

Got insurance? Perhaps Mommy or Daddy can get a replacement one for you if you do not have insurance.

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