Korg DW8000, Mono/Poly, MS-20...

I recently aquired this equipment, along with the owner's manual for 
the DW.  I was used to a Yamaha PSR-6 which has built-in voices, and 
am primarily interested in playing digital piano thru an amp.  I find 
the manual for the DW to be fairly technical in that there is an 
absence of any direction as to how to set parameters to achieve any 
particular voice. I have no clue how to use the MEX.  Additionally, 
I'd appreciate any advice about what amps would be suitable.  Look 
forward to hearing from any members.
Tks,
GW