Very Beginner question - need directional guidance

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Open CV was brought to my attention by my IDS camera salesman, and would like to know what would be the best way to do the following.

I want to be able to automatically align a laser marking galvo head to an XY motion stage under it.

I would mark a cross pattern with the laser galvo head, and then with an attached camera, move the stage to each cross hatch intersection and record the error (or move distance required) between the location of the mark, and the position of the stage.

There may be 6000+ cross locations (ie a 1mm line space X/Y over a 90x90 mm scan area, so I would like to automate this, as doing it manually would take way too long.

My camera has about a 5 um pixel size, so I wouild like to get the accuracy as close to that as possible

I would prefer programming in C# (the automation software I am using uses C# or Labview), but can use C++ as well if required (as dll subroutines).

I would like to know what would be the best place to start, and which help files/documentation etc should I start with.

Thanks for any help