1) Do you want to start knowing each other? Obviously, this would be easiest for me.
I'm certainly okay with knowing the others, even working on a group background. If others want to all meet up in custody though, I can do that too.
2) What are your limits are far as torturing your characters? I'm not going to go out and do something that a person isn't comfortable with, though I do intend to push the edges a bit.
Well, I'm... for the things I do like, I go fairly extreme, but it's a kind of narrow field. I'd say a definite no to mutilation, burning (beyond branding), cutting/impaling (piercing such as to give nipple piercings or whatever is okay), urination/defecation, animals, very animalistic looking humanoids (were-creatures in hybrid form and most things that are considered "furry". Minor features are in the "completely okay" area)
I don't really want, but won't flee from, intelligent undead (that aren't rotting), male rapists, being hit in "non sexy" ways (out of combat, that is - in combat, anything goes) such as actually punching, or any kind of striking to the head, being spat upon.
Things I'm totally fine with include being molested or raped by females (including strap-ons or other objects being inserted by them), being forced (physically grabbed and held down, or the "If you don't, then we'll do X") to provide oral (to either entrance, as long as it's clean) on females, being pinched, branded, tattooed, pierced, spanked, whipped, caned, cropped (etc. etc. And although the buttocks are a wonderful place for that, the thighs, calves, anus, breasts and crotch are also on the 'yes' list), having painful things (nettles, ginger root, chillis) inserted/scrubbing with rough bristles, being tied up in various ways (hogtied, shibari, etc.), being mounted on various punishment devices (vaulting horses, sibians, the triangular things that you sit on that dig into the crotch) and so on.
3) What sort of setting would you like? As far as created settings, I only have the Eberron book and even then only the base book.
Honestly, I'm usually more interested in the characters than in the greater picture of the world, so it doesn't matter - it could be a specific setting, one of your own creation, or a basically generic one.