Purchase The Dowel Rods You need for each size
Mark 1" Dowels at the 5" intervals Mark the 1/2" dowels at the 3" intervals
Wear Safety Glasses
Using a saw cut each dowel at the marked interval, you will need to keep the rod steady when you cut and secure, which may require holing it with your other hand or securing it with a clamp to a work surface you can cut on.
Cut each dowel at the marked interval.
You'll want to sand the ends to remove the painted marks (if your rods have them) or if the ends are too rough (again optional) You do not want to keep the paint on the ends of the rod, it may not be suitable for use with food!
Once you've cut all the pins (tubes, forms, molds) gather them and wash them with dish soap and water to rinse and allow them to dry.
Once dried cut NONSTICK foil to cover the newly created tube (form,mold, pin) leaving enough to twist each end like a "Tootsie Roll"
Store covered with aluminum foil (unless totally disgusting) in a plastic zippered bag or a snap top container.