Too late, once you won an auction, your information is automatically sent to the seller in the order details.

You ask first before you bid. Strange and creepy in what way? Then why did you bid?

Once you bid, it is a legal contract to purchase. If you don't, then you'll be a non-paying bidder which is not good in EBay.

Just use PayPal, your money is safe, your purchase is protected.

Difficult to say...especially without knowing about the order