We sell things on CL all of the time. The secret is a great photo. Be honest about any stains or any cracks. scuffs.. etc. Take photos in all directions.
We try to use words like, "Never used.", "Slightly used",
"Well used, but still in great shape."
"No smoking house hold." "No pet household." If these apply.. This is a selling point.
"Still has paperwork." "Still have original box."
Yes, only accept cash. If once they show up they try to bring you down on the price, you have every right to tell them no if you feel the price you set was fair. IF they point out a flaw you did not mention.. then consider coming down a bit. No one likes to feel they have been mislead.
You may even want to upload an ad for the brand new version with a price so people can compare, what a great price you are selling for.
If you are selling alone, meet up in a public location not your home.
OR if you are going to meet the person at your home.. Make sure you have your spouse or a friend there with you.
We have had great experiences selling and purchasing all sorts of things on Craigslist!