I'm new to eBay and I need help?

[.....]

If you bid $1000 on eBay is that the amount you buy an item for?

[Jack]

You bid your maximum bid (the most your willing to pay) which in your case is $1000. The current bid is always the second highest bidders max bid. If bidder a placed a bid of $500 then Bidder b placed a bid of $800 the current bid will sit around $500. However if you place a bid of $1000 the current bid will jump to around $800. You will remain the highest bidder and will win the auction only if everyone else bids below your bid of $1000. The second highest bidder will govern how much you end up paying and that could be different one day to the next for the exact item. But you will never pay more than your max bid which is why you should bid carefully.
Ps. You can bid more than once on the one item.

[flower]

An auction means that the highest bid is the winner. That is not an offer, it is a bid. If an item is a fixed price, then you pay what seller is asking. If there is a reserve price, it wont show on the listing, you make a blind bid.