Make sure you eat and drink something before flying.
Make sure your batteries for headset/accessories are good.
Make sure you don't rush your daily inspection.
Make sure you check how much fuel is onboard before flight.
Make sure you do a fuel drain at first flight and after refuelling.
Make sure the helicopter is not overloaded and within CG limits.
Make sure you do a hover power check before flying off.
Make sure you keep a good lookout especially in the vicinity of the airfield.
Make sure your radio/s are on the right frequency.
Make sure your main rotor is untied before start.
Watch out for wind, wires and wildlife.
Be aware of density altitude and effect on performance.
Don't pull more collective than the engine can handle.
Brief your passengers. Remove passenger side flying controls if able.
Look around when flying for places to land in case of emergency.
Keep an eye on the weather. Stay away from clouds.
Help out other crew and mechanics.
Keep the rotor RPM in the green range.
Don't hit the edges of the sky. Have fun!