if i want to bill my customers by myself, how would i do this, first i would need a secure server address (https://) how much would it cost?
and what else would i need to do the credit card processing by myself?

you could check with CardService International, they offer everything that you need...
others include paypal and cybercash

you need a Merchant account and Secure Payment Gateway, and some type of shopping cart, that should be it