Everything seems connected , what seems to be the issue ? although i see the last owner has put a custom white plug going to the rear lights.
You have a 3 plug CDI unit which is good, it is similar to the GT125, so look below
Needing a little help with my current project (+GT125 CDI PIN OUT)
GV250 = Some models have clutch switch but some early models do not use clutch switch , it was up to South Korea.
If you have a side-stand switch ===> Cut the side-stand switch at the side stand leg. Join the wires on the harness to bypass it, use electrical tape to hide this so naked wires are not exposed , then hide it far away from the road , so that water / dirt does not try to cause ingress.
Regards