You know you can walk into a walmart, buy a prepaid credit card and you are set? It works just like a credit card, you can add money on it anywhere you go or use it like a credit card.
No offense, but you don't need a credit card for Aces, a prepaid card anyone can buy (not sure about the age restrictions however, your parents might need to buy it and then you can add money on it).
Simply goto a convient store, give the clerk $20 and you are set.