Thank You, For Taking The Time To Meet With Me. Would I Use A Comma In That Sentence?

No, there is no comma in that sentence. If you said 'thank you, that was very kind' you would use a comma. The difference is that in the first sentence you are saying 'I thank you for doing something' whereas in the second example you are saying 'I thank you. That was very kind' 2 sentences disguised as one.
English is a very difficult language to learn, and almost as hard to teach!

The comma can also be used to define a break in your thinking/to emphasize the "thank you" to make the reader stop for a second and read the words before the comma. As in a response for something the person did for you . Thank you, for answering my question.  or thank you! For answering my questions. Or thank you? For answering my questions. I guess it is combining text with proper grammar. Or how about thank you :) for answering my questions.

No , because there's a reason why are you saying the word " thankyou " or whatever but you shouldn't use that comma.