So this is how I usually work, 1 single studio light, ISO at around 200, shutterspeed at 250 and aperture usually at 7.5
Only with daylight I play with the aperture and ISO
It is better to have the images too bright instead of too dark. You can always have some information back in lightroom with a darker exposure. But going from dark till bright you lose a lot of information and the image will have a lot of noise