OK after continuing my search I finally came across this:
markerstr = createMarker ["marker1", [4418,4396]];
markerstr setMarkerShape "ICON"; "marker1" setMarkerType "Select";
"marker1" setMarkerColor "ColorRed";
Note:
["marker1", [4418,4396] = Markername and placement Co-ordinates.
Just thought I'd follow up for anyone else who has been looking and had the same trouble finding this information as I did.