The business/marketing of pen-testing.

I've had an interest in computer security for some time and I'm now looking at 
starting a business around it. There are *no* other such businesses in my 
area but because of this, I'm not sure how to sell my services to potential 
customers or even what my target market should be (small, medium, or big 
business).

Anyone have any suggestions as to where I could start looking for information 
on this side of things?


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