Basically, include as much information as possible.

Try and inform the Buyers/Sellers of what exactly you want to buy/sell. Try put the most relevant information in the ad title.

The following details should appear on your ad:

• The name of the item
• Make and model (if possible)
• A good description of it, including the condition it is in
• Include a manufacturer's website showing the item if possible
• Payment and dispatch preferences