Write an ad. Describe what you have for sale or are looking for esp if it is a non standard item.
Put what you are looking for or selling in the title.
If you are selling a car or item, do some research. Sure you can start high but if it too high for current market, people will just ignore your ad. Put a price on your item in the ad, many sites require it anyway. Many will ignore an ad with no price because we don't know what you are looking to get. Titles like; FS, For sale, Wanted, Looking For etc do not reach out for people to look at them. It's is a tight market and if you are look to sell or buy reach out to your market, the words are free. I can understand not being able to post photos. If that is the case a good description will help a lot.