To make sure you have a good solid system you need to realize that there is no "cookie cutter approach". Using pre-existing procedures developed by another is an OK way of identifying a good format and the basic addressing of requirements, but your system is and will be unique. Don't just cut and paste. Define how your organization has to address what 14001 requires and then do it. If you just use what others have done it's not your system, it's theirs.
When asked to help folks out, I let them know up front that I do not write procedures, policies or work instructions. I will provide guidance and review what has been done, offering up suggestions for improvement. If I write everything, it becomes my system and that sense of ownership of/by the users never materializes.
Go for it. If you miss the mark remember the term "continual improvement".