Hmmm...where to start!
Ok, here are answers in order:
G41 (Left) G42 (Right) tell the machine what cutter comp to use. Instead of thinking of left or right, think climb vs conventional milling.
Your 'orgin' is set on the machine during program load/setup.
When you load/setup your program, you will (generally) assign your tools, by size and Z (quill) offset.
Sure post the code. I'll have a look at it. Let me know if you have any other questions.
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