I started a small IT consulting firm based in Toronto in 1995 with me being the only employee with ZERO initial investment. Then I hired 6 staff in 1996 and grew to 45 in 1999 and again to 64 in 2002. Then down to 2 in 2003 after the tech crash when everything went to India overnight. Now I'm back up to 20 staff. As far as non-investment/service business is concerned, I can't think of anything more profitable than IT outsourcing regardless it's legal, accounting, medical, engineering services: no start-up cost and profitable from day 1 without a single month of negative cash-flow. If you know any better service business than that, I'm interested in finding it out from you.