Charlene:
There really isn't a pamphlet or brochure that I've seen that give a point for point quick overview of trans-101.
Your best bet would be to either point them at the wiki here or over at tsroadmap. Additionally you could print out certain sections from either to create your own brochure.
Also there are several good books that explain being trans from the family/friend/co-worker point of view. Possibly one of the best is "True Selves" by Brown and Rounsley.
Possibly the reason such have not been created before is that the intended audience could be so wildly different, it would be difficult to put the relevant points into a pamphlet without missing something major.
And really, the best way is to write something yourself. Prepare for that meeting. Then write down what you would want to say. As you may be aware, this is such an internal struggle for us, but people only see the external changes that are driven by those internal demons. If you write something personal to describe your feelings, people would have a better feeling for your change.
-Sandy