When you get your first job in advertising, which is the hardest part of the industry, stay positive and stay current. You just came out of school and should know Facebook, myspace, twitter, foursquare, LinkedIn, Spotify, and all the other fun social media outlets. If I have to explain any of these to you, you will not get the job. Just sayin' . . .
Also, you aren't going to work on the good stuff. You are going to get the clients/work either A) no one wants or B) you can handle without fucking up. While this might seem sad and depressing, get over that fast and figure out a way to own your client and make it the next Old Spice or what ever great client is out there when you are reading this. When I was a junior, Carlo gave me a great piece of advice. He said, "Anyone can make surfing or pizza or sports cars sexy, because they already are. But when you are able to make oil and computers sexy, that's when you know you've done something great."
So go do something great with a client and have fun while you are doing this because in the words of my amazing boss, "I would rather be doing this than working in a bank. Bankers are assholes."