Welcome to Cornell CS
Congratulations, and welcome to Ithaca! Now, go make yourself a webpage. No, seriously, do it now. I'll wait.
Did you really make a webpage? If so, good for you! If not, what are you waiting for? Getting a PhD is about many things, but mostly it's about joining the ranks of researchers and contributing to the "market of ideas". But how can you do that if no one knows who you are?!
Ok, now that you have your own website, spend some time reading someone else's: Matt Might's blog. Scroll down to "Graduate School" and start reading.
To Be Continued.