You probably realize that there are around 7,000,000,000 people in the world of whom around half think that they can or should write a book. Take off about seven of those zeroes and you have an idea of how many publishers there are out there (and I'm being over-optimistic here, I suspect)
I don't know you. You might be one in a hundred thousand and have a book the publishers will snap up. You'll have to ask yourself that one.
Some great responses below. For my few cents worth: Put the Intro on Hubpages and ask if anyone would like to you to place Chapter One on. From the responses, you'll know whether it's worth putting more on.
As for the publishing houses, good luck. And watch out for the scams.