You will need a wireless lav mic.
Two manufacturers of such systems at entry level prices (as wireless can be very expensive) are Sennheiser and Shure (there are other manufacturers, of course).
Now, one issue is to find the way to hide the mic under your Mark Twain clothes. You might need some training, find appropriate accessories (like gaffer tape or ...
Depends on the radio RX.
Lectrosonics, Micron and Zaxcom can output at mic or line level,
Audio 2040s and the G2 range are mic level. The mixer doesn't make a difference long as it can take line or mic in.
Dynamic is mic level without power, so depending on your RX it would be line or dynamic (mic) level
The inputs make no odds. SQN are noisy preamps, ...
Besides the COS-11 and the Tram 50, other popular choices are the Countryman B6 and the DPA lavs (some also like the smaller Sennheiser models).
As to technique, the best source I know is jwsoundgroup.net. It has an abundance of knowledge on this kind of area, and I know there are even some threads containing links to the biggest discussions about it. Don't ...