superman91, you don't get credit card right away. When I got mine, I started to work and as soon as my first paycheck came, I tried to open up an account with my bank, they denied me outright. Then, my aunt who had an account with the bank, I was referred by her and finally got in with the minimum balance on the account. So, I got my debit card and checkbooks mailed in to me within next 1-2 weeks. Over the course of 5-6 months,I accumulated pretty good saving. I think during one of those visits, one of the reps suggested me to get CC and I said okay. I made a selection and they're saying all those interest rates and credit back stuffs, which I didn't get but anyhow I got one. 

I've my score over 750 which is pretty good if not the best.
Once you get your credit card, always stay below 20% usage. If you want to accelerate your credit score.
Say if you get $500 credit line, you don't want to spend more than $100. Just stay in within that line and see how your credit score will rise up. I know it doesn't make sense but this is how their math works. I've taken classes on these things from my college and now I'm the trustworthy citizen of this country with solid credit score. Always try to stay below $100(assuming $500 is the credit limit) for first few months, then as time progresses, you can go upto 50% but just make sure to pay it in time. That's how it works. Once you'll get your credit score risen up.

Then go for American Express. This is the best credit card I've ever had, highest return and sooner. They've twitter account and it's a blessing for techsavvy folks like me. People are friendly over twitter :D

You can also check your credit score for free once a year, it's a federal law. If anyone interested on that, I'll write more later on.

And, don't get more than 2 CC(preferably Visa and Amex) , if you are really serious about your credit score. You'll understand these things slowly.