The main part of a good SOP is the expanded checklist. I have a good checklist that you can have a look at (its for a different type though...). It specifies each item with what to check for, what to do and if there is a callout for that item. It may seem like making the job really complicated, but if it's a multi crew environment it really helps if everyone knows what's happening.
PM me if you want to take a look at it.
/LnS