On a more technical note, cyanotype is a UV light-sensitive photographic process, which means you'll have to do your exposures in full sunlight or with the help of a UV light box. You also need to prepare your materials in a darkroom or a dimly lit room.
Making the exposure is actually as simple as putting an object over a taking medium coated with the UV-sensitive cyanotype chemicals. How long you should expose it depends on the intensity of the sunlight you're working with. . thephoblographer.com