self help legal books

What is the best way to market a self help/how to book ?
I have written a short how-to book about how to get a drivers license in another country that is totally legal to use in the US reguardless of the state of the persons US drivers license. I wrote the short book and would like to sell it on the internet and delivering it using PDF format.
Even before marketing any book, you need to have some idea if there is a demand for the book and what the demographics are of the demand group. I think it highly unlikely that the rather small demand group for the product you suggest would be internet saavy. As a result your product delivery method might not be ideal.
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