While in college, I was hired by a company that was running a webhosting business out of their basement. It was quite amusing but apparently they were making a ton of money doing it. Back then I believe they were running everything off of a single T1 line coming into the house. I'm not even sure how they managed to coax a company to give them fiber to their house since its a residential area.

These days a T1 will not suffice so good luck with your venture. I wouldn't recommend it.