eBay questions

I'm quite new to the eBay and I think putting some auctions going..
I thought this would be a good place for help. :)

1) Does it cost anything to place an auction (does eBay charge this)?

2) When the auction ends, will it be a normal trade wetween
        the seller and the winner?

3) And if there's no winner, what will happen?
        Will I get a record to show I'm selling unwanted
        items, too high prices etc??

Sorry for the dumb questions and non-U2 content,
but I thought this would be the best place to ask things
like this, since Wire is usually very helpful!! :)

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