Auto Focus/Z Height Setting (help)

[lucky phil]

Hi all
I have just purchased a secondhand (unused) Chinese laser cutter/engraver. There is no name branding on it but was told it is an Omni 600x900 100watt, unfortunately it didn't come with a manual.
I haven't turned it on yet as I want to make sure I have it set up properly first, I am in need of a copy of a manual if someone can help out, also can someone help me out with the auto table height setup.
Attached are some photos for clarification.
Photo 4 shows the probe mount on an angle which I expect should be parallel to the X axis gantry.

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