The basic introduction of the club, you have to let them know the history of your club, what are the major events and key events, what is the focus of this year's work, what must be done, and what you can do flexibly.
In the introduction of specific affairs, you should tell them what each person is responsible for, how to do it and who to look for. For societies with a clear division of labor, this will basically be taught by the elderly in various departments. If you are younger, you are probably teaching alone. Personally, I think it is most efficient to start with a specific activity and explain to them how to do it from beginning to end. For example, what forms or applications need to be filled out in the early stage of the activity, how to write the planning book, how to write the work summary, which units of the school or college teachers need approval, which businesses to find for sponsorship, what form you will take to advertise to others, which provider you usually rent your equipment (sound stage) from, which printing shop you will print your publicity page in, the configuration of all necessary items in the middle of the activity, and the cleaning after the activity.
The above two points are actually the simplest and most practical. If you haven't experienced the above things yourself, learn from your officers. Four years' experience tells me that the most important thing for a club to do well is whether it is pragmatic and pays attention to details.