The popularity of jazz music, due to its rhythm or swing, improvisation and lilt received a fresh boost with the advent of the radio which all but killed the record industry. Today there is a fresh awakening of interest in learning jazz music. Thanks to the internet there are a large number of web sites which teach how to practice jazz bass lines.
One such web site has more than 140,000 videos with trained professionals, some of whom have learnt from the Beatles, teaching how to practice jazz piano. So you could start by seeing your instructor teach the basics on a piano. The basics could be how to create a bass line, how to play an octave and how to try and walk rather than to jump while using your left hand. You can practice jazz bass lines for jazz piano in G major, in A major, in C major and so on. The professional will teach you how to improvise in Db major and on playing a walking jazz piano bass line.
