I really want to play but....

[Alteiriaa]

First payment will be the first time you pay your sub. So when you get it depends on you!
You might be able to throw down as soon as launch, though I don't know if you would get it right then or if you'd have to wait until after the free time is finished.

Edit: actually iirc again, you can pay in 30 day incruments for cheaper (ie, 30 days, 60 days, 90 days), so if you pay for the 30 right away you should get it right away? It may depend on payment method though. Sorry if this makes no sense, I'm not thinking so good, hehe.