IMO, Retal, I would learn to play the PSR3000 in arranger mode NOT the piano. Just learn the chords of one of your favorite songs in your left hand and play the melody with your right hand. This will teach you chords and melody line. Then learn to play the chords for another song, etc.
Trying to learn piano at this point might be discouraging.
Starkeeper
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I play Roland EM20 and Yamaha PSR550