1979 Honda cm185 twinstar electrical issuse

I got this bike for free knowing it didn't run and it might be missing some things but the issues are: no spark, no electric start, seems like low power because the horn barely sounds and the high beams don't work but lows do and when I hit the electric start there's a click from the things that are right where the power goes off the positive I'm using a battery charger because I need and need battery a