A wizard helps for the first basic configuration, and for the first steps.
To restore the default configuration( after troubles, ... ), this wizard can be re-started using the menu Help/wizard.

To start to play with a Score, use the space bar, following the rhythmic synthesis. With some training, you should be able to "play music".

To progress, study the menus in the Score window, use other keystrokes to have dynamic playing, connect external Midi devices to improve your music. You will discover quickly all the possibilities to improve your way of playing your music.