I'd love to learn Serbian! May I help in return by teaching you English or Japanese, rather than paying?  Hvala :) 

If you know Serbian you can speak with someone who come from Croatia...

Natsuko F-H, I will help you about Serbian,i like that you want to learn my native language. :)

I like to learn Serbia, but I dont have anything acount to pay that. Could you helpme how to buy credit if dont hanve anything acount? (I dont have paypal, master card, visa e.t.c)

In that case I'd like to learn it. I started learning Croatian about two months ago, but have spent so much time concentrating on my studies, as well as German and Chinese, that I've neglected my other languages.