What does 'Image-Building 101' stand for? Especially explain the meaning of 101 in detail, please.
Without knowing the full context I assume that Dr. Dumoor is good at promoting the public image and profile of himself and/or his practice. Hence, the speaker is jokingly suggesting that a basic course in "image building" might have been part of the doctor's medical studies. But I take it from your question that this isn't the part that really puzzles you.
"101" means the basic, introductory or most general level of study for a particular subject at a college or university. It's derived from the system of numbering courses in America. Here's a grab from the Yahoo!Answers website that explains it.
"101: Although there is some variation among the universities, generally speaking, the first number indicates the year level (1 meaning freshman, 2 meaning sophomore), the 0 indicates entry level (as in the lowest level course offered within the first grouping) and the second 1 indicates that it's a survey course (which is broad based, rather than specialized courses that one would take later on)."
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