Jai
if they were paid for by paypal print off the postage labels from paypal, you need two lables in your printer then a plain piece of paper.
address and payment will print first, then customs declaration, then proff of posting cert.
send it small packet air mail, not air sure, it doesn't ask for dimensions then drop it off at the sorting office, not a counter, and because it's pre-paid they don't hassle you for size, they just stamp your proof of postage and job done.