I skimmed through here, and I'm sure it was said, but if you get a card (emphasis on the singular), make sure it doesn't carry an annual fee. Length of open credit accounts is part of the algorithm of your credit score, so if you have a card with no annual fee, you can leave it open forever.

Think of it as laying the foundation for you to play this game later.

I like the Chase Freedom as a first card, but only when you're ready.