I believe most of the settings are mentioned in the guide except view distance. Play around with the settings until you find the visual settings and framerate you are comfortable playing with.
I just bought GTA V.In which setting would I receive the best gameplay?
Specs:
AMD FX6300
SAPPHIRE R7 260X
6GB RAM
450WATT COOLER MASTER PSU
Put everything on normal apart from texture quality put that on high, have fxaa on and no aa. leave the density and that alone and just stick with the highest resolution your monitor can run. I have a R9 280 and these settings work great for me and they look good too.