Open Cart Custom Payment Module

Hi! I need the development of a new Payment Module in Opencart latest version 1.5.1.3 i think? I will give you a form and you have to put the form into the module of payment by credit card and visa, when the customer finally click on a button of PAY , then my webpage send that form to the Bank Payment Gateway, and the customer only puts his credit card details in the Bank Payment Gateway and he pays, then he is returned back to my webpage and you have to analyze a variable of the payment gateway and redirect the customr to a webpage that says that the payment has been ok, or that sais that the payment is worng and let customer make payment another time. I hope i can explain it well. I will give detailed instructions to the coder wins here, i will give all info i have from my Bank payment gateway. I am an student and this is my first Start up online shop, i hope your prices are reasonable. Thanks