On the lighter side you might like to take a look at the Garth Wallace books*. These are the tales of a rookie flying instructor in Ontario, Canada. I suspect they will either fire you with enthusiasm, or put you off the whole idea. Either way they are an amusing read. Like all good books, they sneak in some valuable information that you don’t realise you are absorbing, until it happens to you.
Another title, more post-training in content, is “The Savvy Flight Instructor – Secrets of the Successful CFI” by Gregory N Brown. This is an American book and is slanted towards the business side of instructing. Hopefully earning a living once you have the ticket.
All the best with your FI Course.
*
Garth Wallace Books