Based on you live style, I'd recommend more presets.
Review what you have on hand, compare to various sounds you want.
Tweek sounds you already have into what your listening for.
Purchase sounds. Search the web for free patches by others (KorgForum)
Search the web for specific forums dedicated to your make & model keyboard. ( Youtube has a video on just about every synth and sound out there.)
Read your manuals. Have your kids program you synth's.
But, I think your right, there are few to none of synth programming instructors out there. Sounds like an opportunity for some.
Good luck and the force is with you.
TI Virus Snow, Radias, Nord Lead 2X, Motif XS6, M3, Fantom X7/G7, Karma, Wavestation, M1, D50, JP8000, microX, microKorg, DX200, AN200