Help!! New Seller, I Think I Made A Mistake

[obinser-0]

I've had my MacBook Air for about 6 months and I no longer use it as much as I used to. It looks as good as new, there are no cracks and no visible scratches, so I decided to sell it on eBay. The starting bid was about $850 and the buy now price was $1,399.99 over $100 above the cost of a new MacBook Air. A buyer, that made an account today, presses "buy now" minutes after I listed my MacBook. I think this is a scam as I've had issues in the past with buyers on eBay. May someone help me?

[disneyshopper]

If the buyer wants you to text him/send your Paypal address/wants you to include an ebay gift card, those are red flags that the buyer might be trying to scam you.  Ignore and do not respond.

If the buyer has not paid by day 4, on day 5 the seller can file a Cancellation with the reason Buyer
didn't pay.  The seller gets his/her FVF credited, the buyer gets an unpaid strike recorded on his
account, no one can leave feedback.  Two or more unpaid strikes, and the buyer will find it
difficult to bid/buy from sellers who block buyers with 2 or more unpaid strikes.  Do you have
your Buyer Blocks in place?

https://www.ebay.com/bmgt/buyerrequirements