Sorry more questions..on WavTrigger

Sensors Sound & Audio
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Well my boards showed up today and i have some more questions (sorry i am so new at this, first arduino type board experience).

on the 16 holes for the triggers, do i need to just put 1 trigger wire for each switch on the outside edge of the board and attach my other side of my switches to ground? (for example i have door switches in my car - 1 wire goes to ground while the other goes to my current sound module (which the wavTrigger will replace)

if this is the case can i buy an 8 single pin terminal block with screws to solder into this outside row of holes?

something like this https://www.adafruit.com/product/2141

on the ftdi basic board i cant tell if the black connector on the bottom is make or female so if female do i need to add right angle pins to the wav trigger ? And if this is the case can i leave this plugged in and just power the wav trigger with 5 volts or would i be better to use the barrel jack and only connect the ftdi board when flashing/programming?

I asked about power before on another post and sounds like i need to buy something to lower the power from 12v in a car. Would 5v , 6v , 9v be recommended? i have read various things. I will NOT be using the onboard amp and will instead use the jack to feed a pair of rca’s to a small amp

Thanks

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Go through all of the docs here https://www.robertsonics.com/wav-trigger and circle back after getting a better general understanding - I will answer the power Q directly though: lowering the voltage allows you to run a higher current at a given max power…this is especially useful if the speaker is powered separately…5-6v should be ideal

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Thanks, I have read the docs. WIll read them again as some of it is a bit unclear (which is why i am posting questions). I went ahead and ordered the ftdi board . The answer to the power question helps a bunch at least now i know which convertor to by to lower the power