hi everyone

My site was thinking about accept credit card ,since customer was asking about cc payment.Can anyone tell me detail how to be a seller who can accept cc payment? do i need to verify any thing ?I do have paypal,and 2checkout account ,but just wanna give customer more conviences.....I live in US.Thanks

P/s: i know there are many cc fraund out there...what is the best way to prevent?verify phone number ?(i guess)