After you listen to and study the etudes in the 1.3 reference, play them with the 1.3 Play track. Try to memorize these etudes. This is how to build your vocabulary resource for improvisation.
1.3 Section 1 Play Track:
1.3 Section 2 Play Track:
Listen to me improvise in the 1.3 video, then you improvise with the open Play Track.
On the Road Again Open Play Track: