need some help with a few problem 90 mazda rx7 s5 na

[ae86nero]

I'm new to thiis forum and I apoligize if some of this info is posted already.

My headlights won't go down and when I try to activate them I hear a buzz noise coming form near the headlight.

My gauges and normal rear red lights don't turn on, the fuse keeps shorting every time I plug the light switch with a new fuse.

My speedometer doesn't work.

My wipers work on only one speed.

My radio doesn't turn on, but the fuse is good.
I searched some of thiis stuff up here and found some answers but I want to know the easiest way to fix these problems, like maybe make a seperate switch for the lights.
Also I failed smog and according to a graph I found on this forum, my air pump is to blame, my low speed test failed.
How would I fix an air pump.

I'm getting the haynes book soon to try and learn more about this car but id really apreciate some help here, I can even part out some parts from my other rx7 for cheap,