Hi, looking for some advice on how to change from a magneto to fitting a 12v battery onto my 1973 Casal,Basically anything that would help ( out on a limb as never rewired a bike before)

As I would like to ride her at night and be able to put an alarm on her, the job has already started thanks to some *+*%! youths who took her for a spin without my permission and stripped her electrics. will be replacing headlight,tailight,indicators,horn and ignition switch, aswell as the wiring ( she’s 38 and deserves new wires) I’m a complete novice so anything simple would help a lot , diagrams and what parts I need would be a great help.

Awaiting anxiously ,

finchy.