Advice wanted for a new seller listing equipment


Going to sell a few pieces of equipment here on Audiogon that I’ve acquired over the past year. What is your best advice for dos and don’ts when creating an add?  Can there be too many pictures? Does copying and pasting  the manufacture’s specs help? Do links to reviews help? Is keeping it short and sweet best when describing equipment?  Is it best to price the equipment in a way that shipping and PayPal fees are inclusive, or is it best to price more competitively with shipping extra? Should I price at my best price and state that I’m firm on the price or allow for negotiation so the buyer feels like he or she got a “deal”? Any sage advice would be greatly appreciated. Thank you for your time. 
kcpellethead
glennewdick mentioned good clear photos of your gear from all sides. Me personally,I can not stress this enough. My biggest pet peave with classifieds is lack of pictures,or one pic of the front. You will have better luck with your sale if you make it easy for the buyer.
Best of luck!
There has been some very good advice. I would also say that you should understand the grading scale and properly rate your equipment. The rating scale is pretty strict. If I see a rating that does not line up with what is in the pictures, it is an automatic no go for me. An item that should be rated as a 5 of 10 that is rated at 8 of 10 does not inspire confidence. 
Make sure when you take photos always take a pic of the back showing inputs/outputs etc. If you are selling speakers take a pic with the grills off I am amazed how many speaker ads I see with grills on. Copy/paste key paragraphs from a review and specs is a good idea. Also to the best of your knowledge tell the age of the unit if known, how long you've owned, first second owner etc.
Thank you all for your comments. I’ve been working on my copy for the ads and I greatly appreciate your advice.