^ all good advice. However, I would definitely recommend getting two cards (but definitely not the same one). Get a Mastercard or Visa, and then maybe an American Express (or another MC/Visa). Also, space out your cc applications. Too many applications at once lower your score quite a bit.
A big factor in your credit score is length of history, so get a card soon!
Also, I would recommend a major bank or CC company (like Citi or Chase) because they certainly report to all three credit agencies on a monthly basis (you probably don't want to hear all the background for this, but it is a good thing), whereas I've heard that the smaller cards, etc. may not report every month or only to certain credit agencies.