If you can easily play any note on your instrument, by name, just as easily (or more so) as touching your nose, then you are ready to begin.
You can enjoy learning blues and jazz improvisation, with chordal accompaniments provided to assist your practice.
You will learn how to use, and deviate from, a wide variety of scales. And you will gain understanding of harmony - chords and their progressions. Your ear will develop powerful skills to benefit your playing.