For cutting files the best file format to use is DXF. Other commonly used file formats for cutting commands are AI, CDR, SVG.
Bitmap formats can only be used for raster engraving and are bmp, jpg, png and tif files.
It’s important not to make the line weight much heavier than 0.01mm. You can’t use zero line weight.
For the colours, wth a DXF the cutting order is listed below along with the RGB values: