8utters - I would imagine there will be someone at the studio to give you advice on the lights, camera settings etc. That's been the case when I've used studios. And, I would hope they would have a light meter to hand as well.
Whilst what Daz says is correct (ie there's no right and wrong setting), generally (for camera setting purposes) you're taking advantage of the available light. So ISO 100 for sharpness and a reasonably high f stop for the same reason (f/9 - f/11). Unless you're going for very dark / moody stuff or unless you want a very shallow depth of field, then that should probably do the job with a shutter speed of about 125 or so.
Shoot raw and use the flash setting on your camera for wb (or maybe about 5500 - 5700 if you really want to set a custom one). You can always change it in PS anyway to get the effect you want.
Think carefully about shooting tethered. Your camera's review screen is good enough to tell you if the lighting is ok (although maybe not if you are really after super creative effects). I did a shoot last week where I shot tethered and had mixed feelings about it. It enabled both me and the clients to see what was going on, but it also enabled the clients to criticise at every available opportunity. If you want to do that for your own peace of mind, then fine, but I would suggest you keep the computer screen firmly angled away from the clients - to be used for your own benefit only - until such time as you decide you've got shots the client may like to review. Its a useful tool, but it can add stress to the shoot.
I would also think your 70-200 may be a bit long - depends what type of shots you're doing and how much space you have. The 50 may well be a better bet (but no harm in going prepared)
I've seen enough of your stuff on here and your website to know you're a good photographer and I'm sure you'll have no problem adapting. But from my (limited) studio experience, it does seem to require a completely different set of skills - to do with talking, listening and reacting to your models. And unless it comes naturally to you, its another thing to learn. Well, it is for me, anyway.
Good luck and enjoy the experience.
And apologies if I'm telling you things you already know - I hope this post is taken as meant.
MV