Add a credit card processor to website

i need to add a credit card processor to my site this site currently only have paypal and wire transfer option we would like to add a credit card option as well , 1. install the credit card module 2. create the potion for credit card in the shopping cart process , near the credit card add symbols of master card American express and visa . 3 . remove the credit card symbols near the paypal option and leave it as pay pal only . attached is a file explaining how to add the module etc .