I'm a management consultant with much experience in process mapping and documentation. In fact, I document corporate systems as part of ISO compliance systems such as ISO 9001, ISO 14001, etc. I shall divide this assignment on three milestones as described. In the first, I need to get more information about your processes and analyze the interdependencies and the way you are doing it. In the second stage, I start documenting the processes in a way that is compatible with your internal systems. Third, I'll build related work forms and work instructions used to manage these processes.
If this sounds convincing, I'd be glad to help. If this is not what you are after, please let me know with detailed information to check it once again.