Hello & welcome to the forum. Edited the email. You have 3 questions in one post, none fitting the engine board topics. Maybe better to repost in the correct boards > Amal & Carburation \ Lucas, Electrical, Ignition.
And use a few minutes searching before posting, you'll find lots of stuff, for example
wiring diagrams.
Also, in
this board you'll find instructions manuals + service sheets which includes wiring.
Good luck with your project, post in the correct boards, add some descriptive pictures when needed to show problems, you'll get lots of help.