I offer mold making classes on an individual basis at my shop.
The charge is $50 per hour plus materials used in class. Basic mold making class will usually take a whole day. (8 hours).
Making masters will take another day plus materials.
May bring your own model to make a mold from. However, I advise something simple to start. Something
that can be made as a two or three piece mold. More than that will take longer and be harder for a beginner.