a great starting point is the instructions / forums
id recommend playing stretched res and sticking to 4;3 if it is supported (if you cant aim on 16;9 res )
general rule of thumg is if you dont understand a game specific setting dont touch it ( this applies to relative legacy )
should be relative by default and i'd recommend you keep it that way
match your fov to be identical across games since you come from csgo that would be 73.74 vdeg
then you just match your hipfire with 360 distance option and ads/scope with 133.33% vertical monitor distance ( both csgo and cod use that as their default)
the end result will look somewhat similar to this
https://www.mouse-sensitivity.com/?share=ec4fad1b8643161f5baeb4883f68ff81