ALmost any paste wax will work if you have finished the plug to a really smooth, painted finish. Apply several very thin coats of paste wax, buffing it out in between coats of wax.
I have used PVA (polyvinyl alcohol) after the wax, but I consider it optional. If the wax is done right you don't need the PVA.
Use a light fiberglass for the first layer of the mold - e.g. 2 oz per square yard. then whatever thickness to build up some rigidity. I use several layers of 6 oz cloth.
If you have a two part plug, I don't think you will need a parting board. Parting board is mostly used when you need to make a two part mold from a one part plug.