First, you should call for other people to come and watch the UFO with you.
The more witnesses, the more credible the report will be to investigators. Second, you should observe very carefully. If you have a camera, take pictures of the UFO that include known objects in the foreground and background. Remember as many details as possible, especially the time, date, duration, and location of the sighting, the UFO's appearance, shape, apparent size and distance, lights, colors, direction, estimated speed, trajectory, motions, actions, sounds, and how you lost sight of it. Third,
after the sighting ends, write down as many details as you can remember. Draw a sketch of the UFO
(even if you took photographs) and a map of the area where the sighting occurred. If the UFO left any physical traces or effects, protect the evidence so researchers can investigate and analyze it. Finally, and most importantly, contact the Center for UFO Studies to file your report.
There is no formal training required to become a ufologist. In fact, ufology is not so much a professional career as it is a hobby. That is, most researchers study and work in this field on a voluntary basis and have educated themselves about the subject. If you are serious about studying UFOs, you must read the serious literature about the subject. You must also attend college and study any field you find rewarding; this will help you understand the scientific method and develop your critical thinking skills. It is impossible to predict what discipline, whether in the social or physical sciences, will contribute to a further understanding of the UFO phenomenon, so knowledge and perspective of any field of learning may shed
light on the phenomenon. Finally, you should try to meet other persons interested in UFOs and who may already be involved with investigations and study. They may have books you can borrow and expertise you can draw upon.