remove your laptop battery, power down, discharge and all that good shyt.
unscrew the screws surrounding the screen, remove the plastic frame.
unscrew the screws keeping the screen in place. gently remove the screen, but don't pull it all the way loose!
there should be a connection in the lower part of your laptop, (left or right, sometimes center) carefully disconnect that (normally by sliding up) and you should be able to turn the broken screen over. Look at the model number at the bottom. Write it down.
ebay or amazon the exact same number and type, order that shyt, and do everything in reverse pretty much. I'm typing on a new screen, broke my old one a few months back. Took me less than a week to get the new screen, installed it in like 10 minutes.
Don't lose the screws, obviously. Make sure you order the right dimensions too. The model number normally indicates size in some way. google that shyt.