Seriously? It's Amazing Spider-Man 129
Here you go.
Amazing Spider-Man 129 CGC 8.0
(insert page quality)
First appearance of the Punisher
THAT's IT! This is not rocket science. You don't need to talk about movie news or the story. Buyers of the book already know what it is. You're not trying to sell sand in the dessert.
That's basically what I put on my listing but something must be missing if boardies are mentioning it.
You might want to put a bit more than that.
Title, issue number, publisher, grade, page quality, serial number if it's 3rd party graded (that doesn't always show up well even in scans), key elements such as 1st appearances, etc.
Some would argue that creator credits - writer, artist, cover artist - is redundant and unnecessary but it could help lend the impression that you are at least marginally knowledgable about comics. And there are still - shockingly - some buyers who will purchase a book because a particular creator worked on it.
Also, it's good to list your method of shipping, a bit of a description on how you pack (without going into excessive detail), whether you'll combine purchases to save on shipping, and what your return policy is.