umadbro?
I'm gonna go out on a limb and guess this is your first MMO. You will get the first 30 days free, but you have to enter all of your billing information. Enter your credit card information, then cancel the billing. You will still get your 30 days. I dont know if they will offer Paypal as an option, but you can do the same thing with the recurring payments there.
Alternately, the same places selling the game also sell 30 day game cards, so you can go that route if need be, but once you put the code in, you cannot take it out... so its not the best option.