I wouldn't count on 75 to 100 per hour. I know several excellent instructors, two of whom are designated flight examiners and they only charge about 50/hr. The guy that I did my CFI and am working on my CFII with is a retired navy pilot and one of the best instructors I have been around, he only charges 28/hr, granted that is through a club. Just trying to say, don't have unrealistic expectations on the money you are going to make instructing. You know how to make a million dollars in aviation, right? ......start with two.

That said, good for you, there need to be more career CFI's out there, keep pluggin'.