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You will need several types of supplies to make your own mask, but you can always use these supplies to make additional masks. These are available online or at large crafting stores. You will need an oil based clay to sculpt the mask. You will also need a form to sculpt your mask on top of such as a Styrofoam mannequin head. You will need a material called industrial gypsum in order to make a mold of the sculpture. You will need some burlap to make your mold 3-D. Select a good quality brand of liquid latex for your mask. You will need a casting latex specifically formulated for mask making, called RD-407. You can also purchase paints or decorations such as fake fur, sequins, or feathers to put on the mask. This will depend on what final look you are hoping to achieve. Your clay will become more pliable for sculpting if you warm it a bit first. Place a few blocks of plasticine clay in the oven at a low temperature (150-200 F) for 15 to 20 minutes. The clay should be very pliable and warm, but not hot to the touch. Do not allow the clay to liquify. To sculpt the mask, you will need the form to stay immobile. You can secure the styrofoam mannequin head to a solid wooden base such as a 12' x 12' piece of plywood. Attach the head with duct tape until it is secure. You should use a thick enough layer of clay that you don't have to worry about it thinning as you sculpt. You can use your hands, sculpting tools, or tools from around the house (like a butter knife or putty knife) to sculpt details including skin textures and exaggerated features. Smooth the surface of the clay with lighter fluid and a small flat paint brush. When you are satisfied with your creation, move on to the next step. It may take you several hours or even days to create the look you are going for.
Gather your materials. Warm the clay. Set up the mannequin or other form. Cover the head with clay and start sculpting.