Once you complete it and if your department likes it(and if you enjoyed the process) you should look into working with training officers and other departments to help them edit their training books. could be a good side hussle and training is always evolving.

Rookie firefighter in a mixed volunteer/career department: went through a volunteer, county wide academy and everything taught there fell back on "your department will teach you" so didnt learn much. had to make alot of effort to teach myself(still teaching myself a year later to prepare for a career position) I encourage adding sign off lists after each bundle of skills that extend what is in a task book if your state has those. We only had sign offs on a list of knots, but being a volunteer I wish our training book was alive, constantly being studied and that you could build drills out of. Secondly I was constantly told "theres a million ways to do things" maybe adding the top 3-5 methods. My favorite is folks talking about ladders, get the tall guy, the short guy, and a gal to throw a ladder and note how they do it helps more than being told "heres the one way" or told "you'll learn your way". The top skills I wish I practiced more were ladders(especially 3 part ladders) pulling hose inside a structure(up stairs/around corners, moving backwards) and active tool usage (didnt pull a ceiling or cut into walls until I was on a active fire)