Agree.
For example,
(1) Safety rule of using airsoft gun
(2) Pre-game gears checking procedure
(3) General wargame rule
(4) Different type of wargame gun (eg Airsoft, RAM, Paintball.......etc)
(5) Protection gears for player
(6) Brief introduction of different wargame sites (optional)
(7) Principle of marksmanship
(8) .............etc