I want to open a site that will sell some goods.. but I don't know how to sell online and get that money.. (I don't want paypal)
Why not use PayPal? It accepts all major credit cards. There are a variety of different options if you want users to purchase goods w/ a credit card. The hard part will be hiring somebody to program a script for you if you haven't done that already. The payment gateway shouldn't be a major problem.
Well if you do not plan to your paypal and can accept direct transfers you can use that, or you can provide mailing address to checks and stuff. Or you can always use 2co and other cc processing merchants.