First of all, you have to find a nice and clean area for work. It will be better for you to choose an area which is not noisy so that you can work without any kind of interruption from the outside.
Take the can and locate its centre my taking the necessary measurements by the help of a foot ruler. It is extremely important for you to take accurate measurement. Otherwise, your camera will not function in the right way.
Now, take the plastic lid and apply the glue on it. Then, place the lid on the can to cover it completely. You must cover the can properly so that no air or light passes through it from the top. Repeat the same procedure to cover the bottom of the can.
After that, take the marker and draw a rectangle on the can. Then, cut the rectangle piece with the help of the scissors and place it on a clean surface. You can use newspaper to provide the can a clean surface.
Take the black spray and paint the lid of the can with it. After spraying, keep it aside so that it may get dried. Now, take the lid and keep it back on the can and make a hole in the centre.
After making the hole, surround the can with the black chart paper. Then, apply some glue on it to attach it with the can. Your camera is ready. Take it out and try some pictures. After taking pictures, you will have to develop and print them.