You can find scores with transcription on notes of the location of your fingers on the keyboard, for different ranges or from semitone to semitone, to make mastering the interpretation with notes easier. The diagrams that illustrate the position of the notes on the keyboard on each string are also an option.
You can use polka dots to stick on the keyboard at first, or for children, with predefined notations or color groups. After you've mastered the notes, you can go to chords and then reading scores for the music you want to perform.