It’s quite easy to install your new Pi Camera. Installation procedure is very well described on raspberrypi fondation website here : http://www.raspberrypi.org/archives/3890
Unfortunatly, cases are not today designed for the camera cable and your new toy. Hard to say, but I did a hole in my nice white plastic case for cable path.
Once your webcam is installed, test it with this command (show pictures till 10 seconds)
raspistill -t 10000
At this stage, you should do a backup because nobody knows where the next meteor will fall down.