Ok, your image is 2284 x 351 (pixels), so it will obviously have to be scaled to fit.
If I scale it to 600 wide, the height will be about 92mm.
So where on the part do you want the image?
And, is that the right size?
Which parts of the image do you want machined to 5mm deep?
Do you want all of the white parts machined?
Do you want all of the red parts machined?
What size cutters do you intend to use?
At that scale, the smallest detail, if you machine the white areas, will be about 1.5mm.
What type of machine? Make / Model / Controller?
The format of the G-Code is different for different Machine / Controller combinations.
"Of course, that's just my opinion. I could be wrong!"
T Briggs (CAM dude) - Siemens PLM Software