Vegas:
We've been in a van, leased to the same company, since 1989 and we've done as well as we need, financially and lifestylewise. Your specific question can't be answered as asked, because we don't know your requirements. How much money is enough? How much time at the house do you need? Do you know the start-up costs? Can you manage your business on your funds til the money comes in, in a couple of weeks after your first run? Lot's of questions, eh!
As far as lease or buy. My opinion for this type of operation is BUY everytime. ALL of your payments, plus interest are deductable in one manner or another. With a lease you'll most likely need to either buyout at the end of the lease period or pay a sustantial final payment for every scratch, dent and ding. Excessive milage will also be a factor.
Welcome to the site and keep those questions coming. Also review the archives for many of the answers you'll need
Terry