Hi
Just wondering which coaxial cable is best to use of it it even matters. RG-6 or RG-59?.

I always use whatever is on site left over from the CATV pull. Usually RG-6 these days. It doesn't matter. RG-59 is more flexible. If you use a data ring instead of a box either is fine. Just use what is on hand in this case.

You can plate them up with an F connector to RCA wallplate.