dashboard light wont work on 1993 Chevrolet G Series Van (G20)

where do look to even begin to figure out where to fix this problem? I thouhgt possibly a fuse but then I was told it may be tied in with something else why its not working ?

is you dash light switch turned off?
when I turn the dial to turn it on the light is still off.
ck bulb and socket for pwr
where do I find bulb and socket , ..I only see all the fuses and wires under dash