Seriously though, "work on the electrical system" is fairly ambiguous.
The coach electrical system? I'm not sure there's any standard thing on that; it seems most of us just leave that stuff (turn signals, head lights, brakes, horn, charging system) alone. Usually the school-specific safety stuff has to be disabled or removed (red/yellow lights, swing-out stop signs, etc) but that seems to be different for each bus.
A 120 volt system? There are threads here for that http://www.skoolie.net/forums/f10/ho...ac-448-16.html
A house dc system? I think there's a thread on that too, but as I recall there aren't the same degree of "standard/good practices" for dc as for ac.
I guess the first step is to define what you want the electrical system to do for you. Here on skoolie.net I've seen it run the gamut from an all-electric coach with electric instant/tankless water heater all the way to just enough solar and battery to warm a hot drink and run a few LEDs.
If you can kind of draw an outline of what you want an electrical system to do, then we can give more specific suggestions or feedback on how to get there.