Go download the manual....
http://www.onlycubcadets.net/forum/s...ead.php?t=4642
It will show you how to rebuilt the whole machine and answer a lot of questions.
Why do you need a new carb? The originals are rebuildable.... Most often guys replace carbs because they can't figure out how to clean the old, or they find out it didn't have a carb problem at all. So..... what's your reasoning?
You can get replacement switches. Or keys, depending on what you need. Is it an original switch?
If you use the "L" terminal, you have to run to the switch with the wire first, then to the lights, but you can pull power from there, yes. Make sure to fuse it.
How do most of us do it? The way it was wired originally..... If you need a diagram, you can view it here:
http://www.onlycubcadets.net/forum/showthread.php?t=35