#1
I'm trying to improvise something based on this video lesson which uses part of the Ab Major Scale and the chords Bbm7, Eb7 and Abmaj7.

What other jazz-sounding chords could i use?

I know Em7 (x79787), A7 (575655), Dmaj7 (x57675) and Gmaj7 (3x443x)... would any of these work?
#3
Eb ninth? theres probably more but to be honest im not very good at working this kind of thing out yet.