To use your uploaded songlist, create a show and open the Show Settings page… ensure Use Song Database is enabled and select the songlist you wish to use.
You can purchase more song databases to use on your account at anytime for unlimited songlists to choose from.
With multiple databases you can also enable an option which will allow the audience to select which database to browse.. eg; have different databases for different genres or one for karaoke and one for DJ etc…