help me in my pursuit of being a career instructor?
Some slightly orthogonal advice to the above ...
There are two kinds of lifetime instructors.  
The first group are like me - we have (usually non-aviation) "day jobs" and we fly and instruct evenings and weekends.  I have been doing this a long time, and intend to still be doing it many years from now.  This arrangement has been very good to me - I am NOT dependent upon aviation as my primary source of income, so I can choose to do the kind of  flying and instructing that I want to.  Note that I have more fun than any ten other people that you know  
 http://www.pittspecials.com/images/sps09.jpg
 
http://www.pittspecials.com/images/sps09.jpg
That's me, inverted in the yellow Pitts, doing an airshow in central america.  I do a lot of tailwheel/aerobatic/multi-engine/homebuilt/antique/warbird/jet instruction, and I like to think that maybe along the way I helped some people not wreck their slightly eccentric airplanes, and not kill themselves.  People not wrecking airplanes and not dying in airplanes is really important to me, but curiously unimportant to many other people I know.  How bizarre.  I digress.
 
The second group are the true "career" instructors, whom instruct full-time as their "day job" and their primary source of income.  Even though this kind of instructor is scorned and ridiculed by many here, they are the true heroes of aviation - they have given the gift of aviation to an incredible number of pilots, and as such have had quite an impact on aviation in Canada, even though they might not watch an Airbus fly itself very much.
My advice to any prospective "career" instructor is that sooner or later, you should probably end up owning and operating your own FTU, for a number of reasons which will become apparent to you as you instruct.  The FTU should not be too small, or too big.  Carefully choose the location (and climate) of your FTU - it will make a tremendous difference.
And, good luck!