Hi Marcmora,
Welcome to the forum.
Firstly you need a high resolution image of the crest then it can be traced (various software available to do this - Inkscape is free) to produce one or more .dxf's (vector files). A Gcode file can then be produced from the vector file (again various software available to do this - LazyCam is free but there are better products available).
If you use a CAD/CAM software (such as Vectric Aspire) you could create a V-Carve type of crest (also check out F-Engrave - this is free).
Overall there is a lot of work (and learning) involved in creating the required Gcode but learning can be fun

Tweakie.