There are two ways to get the payment. You can have them trade with you or they can send you the gold via mail/PM.
Also, I'm lvl 53 and I JUST got 4.5kG. You're new, you're going to be poor for a while unless you buy some AP and sell some stuff off that Item Mall.
I'm sorry to say but if it's costumes you're going for SAVE it for level 60+