1)Getting the payment -whats the best way to do it?
Multiplte options, you
have to have a PayPal account, even if you don't accept payment through it. You can indicate in your listing how you accept payment, chequer, bank transfer (details provided
after bidding has ended to the succesful bidder), or another payment system.
2) Is there several ways I can deliver to the eventually buyer?
I'd imagine you only want to deliver the item once
You can choose how its delivered, check out Royal Mail for their prices based on dimensions and weight, compare to others such as City Link etc. list the price for delivery you want (and include packaging).
3) Can i use my credit card for accepting payment.
I don't know, but I very much doubt it.