Sounds like a fun project. I like to start with a rolling frame, suspension in place and all steering components as well. After that it’s all motor work. Soup to nuts with the carburetor, exhaust and drive train in place. Fill with required fluids and check for leaks. Don’t be afraid to use thread lock as you go. It really helps to prevent bolts from coming loose.
I like to clean up all the major tools wipe everything down good and its on to the wiring. After the wiring is complete I like to do a quick check to see there is spark and the starter is working with the push button etc.
After that it’s all about the brakes and controls on the handle bars and foot pegs, shifters and brake pedal.
Once all that’s good to go the. The gas tank, plastics and wrap the last few details up test the lights and you should be good to go.
If it all goes well and rides proper go back over the bike after a few rides one more time checking for any loose items, bolts screws etc.
good luck.