the above person has a very good answer already, just some more thing to suggest:
Just pretended that you are a professional performer like Li Yun Di. Dress like a pianist.
Programme notes is actually the leaflet of the normal recital, like the leaflet that you can get in a recital. They usually have the information of the songs that they play. So that is what you have to do. Get one to have a reference on what you should include in your programme notes. Also you can go to wiki encyclopedia to search for info of your songs.