What happens next?

How to write a training manual
Review and compile the information the manual needs to cover.
Never write a training manual from memory. Go through the various processes and knowledge points that your manual is going to cover and be sure you are clear on everything.
Make a list of all the important information and refer to this list as you write the manual, double checking to include it all. Even skipping a small step may confuse your users, so pay attention.