You do not need to really know most of that stuff - the most important things are just the actuation force of the switches and the type (linear, clicky, tactile).

I would just recommend going to a physical store that has any brand(s) of mechanical keyboards and try them out - then you will know if you want one with higher actuation force ("heavier" switches - harder to push) etc etc. Instead of a switch tester I would probably just recommend starting with getting a deal on a decent cheap keyboard that is close to what you want and see how you like it after testing.