1st Gen S10 wire problems

Alright guys, first of all its a 89 S10 ext Cab 4.3L and I have no idea about anything to do with wiring unless its for systems, heres my problem..... this should be a long one

Front: Passenger side headlight doesn't work but drivers side does, drivers side markere lights work but passenger side doesn't

Back: Break lights work only when lights are off but when lights are on they dont work, reverse lights dont work at any time...One brake light if I take it out brightens up the rest but if I put it in dims them out on passenger side.

Interior: Cluster lights dont work at all but heater panel lights work, turn signals/hazard dont work at all when I flick the switch causing none of the signals to work all the way around the truck.

Now could this just be a bad ground some were or a few of them, or a bad wiring job or what the hell can I do to fix these problems or at least a few of them. Thanks for the help guys, much appreciated.