Free box-design demo files for flatbed cutters (plain or printed boxes via contour cutting): https://cncu.co.za/FlatCUT-Flatbed-Cutting-Machine/Box%20Design%20Demo%20Files/
About 360 vector designs, ready to use.
Crease before cutting. Dual-blade machines: one blade creases, the other cuts.
Cardstock/paper is ordinary; no need to wait for a special pack to start.