It's a standard scam format Melvin. The guy replying to your ad can't come in person but will send a rep. You'll get your money electronically beforehand, and all you need to do is give the respondent your bank details. Then he'll see to it that your account is emptied, along with any other accounts like credit cards and paypal which he can hack into.

I had an exact same format reply to an ad for a caravan awning I was selling. The guy said he was really keen, but as a marine engineer on a ship he couldn't come himself but he would pay by Paypal and then his transport agent would come to collect the awning. When I told him to get his agent to bring cash, he replied with the exact same email he'd sent originally. So I ignored him.

Let the seller beware!!

Gordon