I learned more about how to handle an aircraft in the first 100 hours as a CFI than I have in any 1000 hours doing anything else.
There are four reasons to get a CFI....
-You WANT to instruct
-You want another salable skill
-You collect ratings
-You want to be a more well rounded pilot
Some of the things I learned as an instructor:
It takes at least 12 hours of work to earn 8 hours pay
On salary, fly fast; if you are hourly, save fuel (same for under or over guarantee)
The time the guy next to you is most dangerous is when you start to trust him
No matter how many times we train engine failures, the first one that quits gets your attention
Good rudder control can get you out of many bad situations
If in doubt, drop the nose