Look for tunes with lots of ii-V and ii-V-I progressions. Try: "Satin Doll," "Crazy Rhythm," "Blue Moon," "Autumn Leaves," "Misty," "Polka Dots And Moonbeams" to name a few. Learn to play the melodies in the right hand with 3-note rootless voicings in the left. When you can do this, play along slowly with iReal Pro with the piano part muted. Then, try a bit of improvisation.