Hi:
There are several things to consider here. First, how much information is needed? The goal here is to provide the information necessary for the worker (operator, manager, foreman, etc.) to do their job. Just as important, maybe even more important, is what is NOT needed. You don't want them to have to wade through 5 pages of "stuff" just to get that one piece of information they need. Balance. Take into account the abilities and training of those using the document.
One way to start this would be to draw a process map, or flowchart, of your process. That should give you an idea of the natural "breaking points" that each document, or set of documents, should cover. You may need to further break these subsections down, until you have a size that is manageable for one document. Again, try to develop documents that can be USED.
Don't forget the tools you have, as well. Some of the best procedures I have seen used a lot of digital pictures, with very little text. You can also use flowcharts, video, whatever works.
Cover the "shalls" in the standard. The rest is up to you. Please, though, do something that works, not just something that sits around until an audit. Look around the work site for "cheat sheets" already in use. They should give you an idea of what the workers think is important. Make sure to include that information in your documents.
I hope this helps at least some. Good luck!