how to get ppc free without credit card?

I want to try yahoo search marketing, or adwords. Please let me know whether i can have a trial without credit card,Please let me know?

some websites do allow you to get the payment by paypal or check. Though adwords is a great way of earning, however, you have to be careful because most websites do not pay you. I haven’t yet come across a website that allows you a trial without a credit card.