To expand on what TS and Luap have said..............
Try having your studio at "normal" brightness, modelling lamps on, maybe the ceiling lights on and then take a photograph with your strobes OFF.
Try something like ISO 100 (200 for most Nikon users), 1/125, f/5.6 - 8 or even f/11 if that tickles your fancy.
Is the resulting image black? If not, lower your light levels (or stop down your aperture) and rinse / repeat.
When your ambient light is NOT affecting your exposure, you'll find having "ambient" light in your studio has advantages .......You save yourself a number of OH&S issues (no dark studio to trip over things), it's easier to find things that you have put down and maybe most importantly, your models pupils will not be all large and black, they will not be all "wide open" due to the darkness.
HTH,
AB>
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