Cheklists
It is often tempting to produce chacklists, for the best of intentions" that end up not relfecting the sequence of events as detailed in the Flight Manual.
It is important to remember that the Helicopter must be operated IAW the Certificate of Airworthiness (Or ARC these days) upon which it states that the helicopter must be operated withint the limitations and procedures in the AFM (Approved Flight Manual).
Therefore, it is vital that all checklists start with the sequence of events as published in the AFM, and once transcribed, additions can be made provided the overall procedure is not compromised and the intended addition considers first and foremost the impact upon safety.
By doing this, in the evnt of a whoopsie occuring, you have the comfort that you have followed the published procedures properly and this may give you imjunity from critism/prosecution in extremis.
Start with the AFM, then apply common dog, asking yourself all the time, IS THIS SAFE.
Hope this helps