Dear Ishita,
You can develop your standing order(if applicable to your company)otherwise you can purchase model code of conduct of your state then develop accordingly to your company rules & regulation but all the matters should be comply with legal law.
Regarding format & othe things,you can develop your company internal code of conducts
Please find attached code of conducts for suppliers(for Next client to suppliers),you can take help that how social & ethical requirements are communicated and you can add all your HR related policies of your company with all legal activities accordingly(your focus would be company to employee).
In case you feel any problem,please let me know and you can contact to our branch offices which covered almost all major cities,our representative will help you.
Best Regards
Sajid ansari-Delhi