Paper stencil method is best for the beginner. Cut out image on the paper. Not intended for intricate designs. 10-15 prints can be made with standard paper. Position the stencil on the print material and lower screen directly on top of it. The screen frame to be used should be exposed but not imaged. The whole screen should be able to push ink through. Press down on the screen frame to make sure stencil is in contact with screen. Apply ink to the top of the screens and slide the squeegee across the frame for your design. You can use the ink to hold the stencil on the screen by flooding the screen first. It is advised you put tape on the surrounding areas of your stencil on the screen mesh.
Stencils are typically used when screen printing solder paste. You can use a metal plate as a screen with holes inside for the paste to come through when the print cycle is actuated. Solder paste is deposited on wiring boards to create connections.
The process of screen printing solder paste is demanding. The right amount of solder paste must be deposited, extremely high registration requirement (typically vision systems are required). The amount of solder being added is relied upon by the stencil. The stencil is wiped down after approximately 10 prints. Vacuum tables can be used to hold the circuit board for registration. The largest take away is that registration is key.