Documenting your procedures is one of the best ways to systemize your business. These documents should be as detailed as possible.
Training manuals can help make the training process smoother for new employees. Your employees will know exactly what to do and what is expected of them. Training manuals allow you to handover your business operations at a moment's notice with fewer complications.
Even a one person business should have manuals and procedures in place. What would you do if you couldn't run your business for a few weeks or more and you needed someone else to step in and help you?
Creating training videos can be faster than writing out instructions. With video training your trainee can stop and restart the video as needed.
Remember to monitor your systems for changes. They will need updating regularly. Any time you make a change, you need to update your training manuals.