A preflight checklist is most useful when it begins before the aircraft is unpacked. Separate the work into three moments: define the mission, prepare the kit, and then verify the field as it actually exists.
Define one useful outcome
Write down what the flight should produce and the simplest profile that can produce it. A clear outcome makes it easier to decide what equipment, battery reserve, camera setup, and flight path are actually necessary.
Prepare the kit as a system
Charge and inspect the aircraft, controller, display device, storage media, and support equipment together. Confirm that required applications and aircraft data are available before leaving reliable connectivity.
Let the field change the plan
Weather, people, obstacles, access, airspace, and equipment condition can differ from the plan. Treat the field check as a real decision point, not a ritual performed after the decision to fly has already been made.