Start with the exact material or product grade, thickness, sheet size, finished quantity and whether the stock is printed or unprinted. If Platinum is cutting supplied print, include the final artwork and registration marks with a 1:1 vector cut file.
Separate through-cuts, kiss-cuts and creases onto clearly named layers. Also identify the visible face, any backing or release liner, grain or flute direction, critical fit and packing requirements. If the job begins as a sketch or sample, send dimensions and photographs so drawing work and material testing can be allowed for before production.