You simply cannot advertise your FSBO property on just one website and expect everyone to find it. Or even anyone to find it. You have to advertise as widely as possible. Advertising extensively could be expensive. In order to advertise as widely as possible, you need to Find as many quality free sites as possible.
Pictures are worth a thousand words, particularly when selling real estate.
In order to complement any advertising copy you use, you should Use picture ads whenever possible. Even if you've found some places you'd like to advertise, placing ads is time-consuming, often repetitive, and each site has slightly different requirements. Almost none of them will actually advertise your property. They just tell you about their search engine placement. No need to waste precious online time hunting around.